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    Re: Here is a good used source for 18650 batteries

    i'll find out - a friend has one

    Comment


      Re: Here is a good used source for 18650 batteries

      Originally posted by stj View Post
      i'll find out - a friend has one
      Thanks
      9 PC LCD Monitor
      6 LCD Flat Screen TV
      30 Desk Top Switching Power Supply
      10 Battery Charger Switching Power Supply for Power Tool
      6 18v Lithium Battery Power Boards for Tool Battery Packs
      1 XBox 360 Switching Power Supply and M Board
      25 Servo Drives 220/460 3 Phase
      6 De-soldering Station Switching Power Supply 1 Power Supply
      1 Dell Mother Board
      15 Computer Power Supply
      1 HP Printer Supply & Control Board * lighting finished it *


      These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

      1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
      2 Hem Saw Computer Stack Board

      All of these had CAPs POOF
      All of the mosfet that are taken out by bad caps

      Comment


        Re: Here is a good used source for 18650 batteries

        Thought I mentioned it... Homemade Grid tie "power wall"... down to conponents. more of a design challenge for a complete power arbitrage system. Use cheap power (solar, off peak grid electricity) to offset or overtake peak price power.

        Expense of parts is one problem but with a surplus of random parts in my parts bin, I must use these when I can. Batteries are not in my surplus however.

        Yes, planning to implement anti-islanding... and have an override!

        Comment


          Re: Here is a good used source for 18650 batteries

          honda used nimh until 2010

          Comment


            Re: Here is a good used source for 18650 batteries

            Originally posted by stj View Post
            honda used nimh until 2010
            Ok thanks
            9 PC LCD Monitor
            6 LCD Flat Screen TV
            30 Desk Top Switching Power Supply
            10 Battery Charger Switching Power Supply for Power Tool
            6 18v Lithium Battery Power Boards for Tool Battery Packs
            1 XBox 360 Switching Power Supply and M Board
            25 Servo Drives 220/460 3 Phase
            6 De-soldering Station Switching Power Supply 1 Power Supply
            1 Dell Mother Board
            15 Computer Power Supply
            1 HP Printer Supply & Control Board * lighting finished it *


            These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

            1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
            2 Hem Saw Computer Stack Board

            All of these had CAPs POOF
            All of the mosfet that are taken out by bad caps

            Comment


              Re: Here is a good used source for 18650 batteries

              Originally posted by eccerr0r View Post
              Thought I mentioned it... Homemade Grid tie "power wall"... down to conponents. more of a design challenge for a complete power arbitrage system. Use cheap power (solar, off peak grid electricity) to offset or overtake peak price power.

              Expense of parts is one problem but with a surplus of random parts in my parts bin, I must use these when I can. Batteries are not in my surplus however.

              Yes, planning to implement anti-islanding... and have an override!
              While you are building this project can you please keep us updated on your progress with this project I sure would be interested in this project
              9 PC LCD Monitor
              6 LCD Flat Screen TV
              30 Desk Top Switching Power Supply
              10 Battery Charger Switching Power Supply for Power Tool
              6 18v Lithium Battery Power Boards for Tool Battery Packs
              1 XBox 360 Switching Power Supply and M Board
              25 Servo Drives 220/460 3 Phase
              6 De-soldering Station Switching Power Supply 1 Power Supply
              1 Dell Mother Board
              15 Computer Power Supply
              1 HP Printer Supply & Control Board * lighting finished it *


              These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

              1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
              2 Hem Saw Computer Stack Board

              All of these had CAPs POOF
              All of the mosfet that are taken out by bad caps

              Comment


                Re: Here is a good used source for 18650 batteries

                Nothing's happening mainly because batteries are too expensive and I'm too lazy to get a circuit board etched since I've been having one heck of a time trying to get it to one layer...so I can self etch.

                Also though most of the components on the board I have (salvaged and parts collection), there are a couple I don't, plus I need to write the microcontroller code. No board, no wanty to write code. Since I don't have code, no wanty to make board. Ugh. Vicious cycle. Really should put it on a solderless breadboard to see what it does...

                Comment


                  Re: Here is a good used source for 18650 batteries

                  Originally posted by eccerr0r View Post
                  Nothing's happening mainly because batteries are too expensive and I'm too lazy to get a circuit board etched since I've been having one heck of a time trying to get it to one layer...so I can self etch.

                  Also though most of the components on the board I have (salvaged and parts collection), there are a couple I don't, plus I need to write the microcontroller code. No board, no wanty to write code. Since I don't have code, no wanty to make board. Ugh. Vicious cycle. Really should put it on a solderless breadboard to see what it does...
                  Why get a development board and try it that way yes can cost some money but you have the building blocks that you need to see if your concept is a good one or not
                  9 PC LCD Monitor
                  6 LCD Flat Screen TV
                  30 Desk Top Switching Power Supply
                  10 Battery Charger Switching Power Supply for Power Tool
                  6 18v Lithium Battery Power Boards for Tool Battery Packs
                  1 XBox 360 Switching Power Supply and M Board
                  25 Servo Drives 220/460 3 Phase
                  6 De-soldering Station Switching Power Supply 1 Power Supply
                  1 Dell Mother Board
                  15 Computer Power Supply
                  1 HP Printer Supply & Control Board * lighting finished it *


                  These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                  1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                  2 Hem Saw Computer Stack Board

                  All of these had CAPs POOF
                  All of the mosfet that are taken out by bad caps

                  Comment


                    Re: Here is a good used source for 18650 batteries

                    Still need to write code...sigh. I think should do this, would open a lot more avenues to implement the actual circuit - the design I drew out was an H-bridge direct drive but with the code I could dabble with a safer, transformer design ...

                    Comment


                      Re: Here is a good used source for 18650 batteries

                      Originally posted by eccerr0r View Post
                      Still need to write code...sigh. I think should do this, would open a lot more avenues to implement the actual circuit - the design I drew out was an H-bridge direct drive but with the code I could dabble with a safer, transformer design ...
                      I still would like to see what you come up with
                      9 PC LCD Monitor
                      6 LCD Flat Screen TV
                      30 Desk Top Switching Power Supply
                      10 Battery Charger Switching Power Supply for Power Tool
                      6 18v Lithium Battery Power Boards for Tool Battery Packs
                      1 XBox 360 Switching Power Supply and M Board
                      25 Servo Drives 220/460 3 Phase
                      6 De-soldering Station Switching Power Supply 1 Power Supply
                      1 Dell Mother Board
                      15 Computer Power Supply
                      1 HP Printer Supply & Control Board * lighting finished it *


                      These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                      1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                      2 Hem Saw Computer Stack Board

                      All of these had CAPs POOF
                      All of the mosfet that are taken out by bad caps

                      Comment


                        Re: Here is a good used source for 18650 batteries

                        I bought a few of these battery packs and they are very interesting for $29.00 for 24 batteries and the BMS protection board which they claim that also works but I have not tested it yet but I will let you know if it works correctly or not

                        This was also bought from Battery Hookup but unfortunately they are out of stock already again for the second time since they started offering this item

                        I am going to use this for a LED yard light that the switching power supply took a shit and can not be repaired because it has leaking capacitors and it is incapsulated with black hard plastic I guess that what this stuff is

                        This operating voltage is 32 volts and this battery pack has this voltage as well I just have to find a weather tight enclosure that will fit this battery pack/BMS board commination I already have the solar panels that I bought a while back that was also surplus but at the time the project that I had in mind had technical issues that I could not overcome at the time so they have just been sitting here collecting dust until now that I have found a battery pack that will work the LED yard light that also has issues and just repurpose both items to be used in another way

                        I am going to be testing this battery pack in 12 volt sections and one 8.4 volt section just to be sure that the milliamperes hours rating that they claim to be

                        I have found that the medical grade battery packs are most of the time are good quality devices and are easily used for projects

                        I will post some pictures of this project when I have completed it so you can see what I came up with
                        Attached Files
                        Last edited by sam_sam_sam; 11-20-2021, 08:04 AM.
                        9 PC LCD Monitor
                        6 LCD Flat Screen TV
                        30 Desk Top Switching Power Supply
                        10 Battery Charger Switching Power Supply for Power Tool
                        6 18v Lithium Battery Power Boards for Tool Battery Packs
                        1 XBox 360 Switching Power Supply and M Board
                        25 Servo Drives 220/460 3 Phase
                        6 De-soldering Station Switching Power Supply 1 Power Supply
                        1 Dell Mother Board
                        15 Computer Power Supply
                        1 HP Printer Supply & Control Board * lighting finished it *


                        These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                        1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                        2 Hem Saw Computer Stack Board

                        All of these had CAPs POOF
                        All of the mosfet that are taken out by bad caps

                        Comment


                          Re: Here is a good used source for 18650 batteries

                          Here is another item from Battery Hookup that is also interesting item

                          https://batteryhookup.com/products/8...-cells-ibh9100

                          Now this one is hit and miss with weather or not you get good batteries or not I bought 6 battery packs and two had bad batteries in them but I can reuse the battery pack case for a project so I am not to worry about it not being good

                          But if you do get good ones they will be at or above 50% of charge on build in fuel gauge
                          One note you do have to use plastic pry tool to open the battery pack enclosure it does take some work to pry it apart but the enclosure can be reused for 8 (18650 battery cells )

                          One more note I am not sure that you can use the BMS protection board or not because I have not figure this out yet
                          Last edited by sam_sam_sam; 11-20-2021, 07:00 PM.
                          9 PC LCD Monitor
                          6 LCD Flat Screen TV
                          30 Desk Top Switching Power Supply
                          10 Battery Charger Switching Power Supply for Power Tool
                          6 18v Lithium Battery Power Boards for Tool Battery Packs
                          1 XBox 360 Switching Power Supply and M Board
                          25 Servo Drives 220/460 3 Phase
                          6 De-soldering Station Switching Power Supply 1 Power Supply
                          1 Dell Mother Board
                          15 Computer Power Supply
                          1 HP Printer Supply & Control Board * lighting finished it *


                          These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                          1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                          2 Hem Saw Computer Stack Board

                          All of these had CAPs POOF
                          All of the mosfet that are taken out by bad caps

                          Comment


                            Re: Here is a good used source for 18650 batteries

                            Here is an update on this battery pack

                            The individual battery cells so far are testing at around 2100 to 2200 milliamperes hours = 3.00 volts @ 500 milliamperes working dropout voltage and 2400 milliamperes hours when battery tester shut off and battery is rated at 2600 milliamperes hours

                            Which means that the useable battery life is 90% when battery voltage reaches 3 volts under load around 80% to 85% if you use 3 volts at 500 milliamperes maximum dropout current

                            The one thing that I noticed about these batteries is that charging curve voltage is not very impressive it is steeper than what I expected to see I prefer to see less steep climb in voltage until it reaches around 3.8 and then level off and slowly climb until it reaches 4.2 volts

                            Now the discharge curve is a little bit better but it is a little steeper drop when battery voltage is around 3.5 volts is when it becomes more steeper than what I expected it to be

                            I will use these batteries in another project because of the charging curve and discharge curve results
                            Attached Files
                            Last edited by sam_sam_sam; 11-26-2021, 10:32 PM.
                            9 PC LCD Monitor
                            6 LCD Flat Screen TV
                            30 Desk Top Switching Power Supply
                            10 Battery Charger Switching Power Supply for Power Tool
                            6 18v Lithium Battery Power Boards for Tool Battery Packs
                            1 XBox 360 Switching Power Supply and M Board
                            25 Servo Drives 220/460 3 Phase
                            6 De-soldering Station Switching Power Supply 1 Power Supply
                            1 Dell Mother Board
                            15 Computer Power Supply
                            1 HP Printer Supply & Control Board * lighting finished it *


                            These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                            1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                            2 Hem Saw Computer Stack Board

                            All of these had CAPs POOF
                            All of the mosfet that are taken out by bad caps

                            Comment


                              Re: Here is a good used source for 18650 batteries

                              To add to the post above

                              The interesting thing about this version of this battery is that not all of these batteries have the same charging and discharging curves I have to wonder if there is some kind of quality control issue when these batteries were made

                              Because most of the time when you have a lot of batteries that are the same version they all have basically the same charging and discharging curves but not this series so I am a little confused about what I have been seeing with this series of batteries
                              Last edited by sam_sam_sam; 11-28-2021, 02:20 AM.
                              9 PC LCD Monitor
                              6 LCD Flat Screen TV
                              30 Desk Top Switching Power Supply
                              10 Battery Charger Switching Power Supply for Power Tool
                              6 18v Lithium Battery Power Boards for Tool Battery Packs
                              1 XBox 360 Switching Power Supply and M Board
                              25 Servo Drives 220/460 3 Phase
                              6 De-soldering Station Switching Power Supply 1 Power Supply
                              1 Dell Mother Board
                              15 Computer Power Supply
                              1 HP Printer Supply & Control Board * lighting finished it *


                              These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                              1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                              2 Hem Saw Computer Stack Board

                              All of these had CAPs POOF
                              All of the mosfet that are taken out by bad caps

                              Comment


                                Re: Here is a good used source for 18650 batteries

                                Update on these battery packs

                                Pack number 2 the battery voltage was a lot better 32 volts instead of 28 volts on the first battery pack tested and voltages not really near each other

                                Radom checked on a few cells and voltages was around 4.0something which is a lot better than the first pack

                                So I am charging this battery pack up with the build in BMS protection board there is no current limiting on this battery pack either because it is done on the charger end of it
                                9 PC LCD Monitor
                                6 LCD Flat Screen TV
                                30 Desk Top Switching Power Supply
                                10 Battery Charger Switching Power Supply for Power Tool
                                6 18v Lithium Battery Power Boards for Tool Battery Packs
                                1 XBox 360 Switching Power Supply and M Board
                                25 Servo Drives 220/460 3 Phase
                                6 De-soldering Station Switching Power Supply 1 Power Supply
                                1 Dell Mother Board
                                15 Computer Power Supply
                                1 HP Printer Supply & Control Board * lighting finished it *


                                These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                                1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                                2 Hem Saw Computer Stack Board

                                All of these had CAPs POOF
                                All of the mosfet that are taken out by bad caps

                                Comment


                                  Re: Here is a good used source for 18650 batteries

                                  hmm... wonder how much I should pay for two 24V 6Ah (12Ah total) Li-ion battery packs for some unknown tool, supposedly new, purchase locally, but I can't refund them. Plan would be to harvest cells only but maybe I could use the BMS if it has one, or perhaps the whole pack. Wonder if it's worth the risk and how much I should pay max to take the risk...

                                  Comment


                                    Re: Here is a good used source for 18650 batteries

                                    If unknown use I personally would not pay more than a dollar per cell but I would at least measure the voltage of the pack to make sure that it does not have electrical issues

                                    One note if there is no voltage on the output terminals of the battery pack it could be that the BMS protection board has locked it out and at this point I would not pay more than $0.50 per cell because you would be taking more of a change that there might be bad battery cells

                                    The only way that I would consider paying more than a $1.00 per cell but a maximum of $2.00 per cell is if I was allowed to open the battery packs and check the the battery voltage but make sure that the voltage does not vary more than 0.500 volts because it has been my experience that if varying more than this then there could be issues with some battery cells and what brand of batteries that were used and milliamperes hour rating that they have all play a part in how much I am willing to pay for used battery packs

                                    One note about 6 amp hour battery pack it could 2p or 3p if it is 3p I would not pay more than $1.25 per battery cell if it 2p then I would go to $2.00 per cell maybe a little bit more if the battery voltage per cell does not vary more than 0.250 per cell and you do not see any signs of battery cell leakage what so ever but my maximum would be $2.50 per cell

                                    Do you know what brand name of the battery packs are because if you do I might be able to to tell you what brand of batteries that it might have in them

                                    If you plan on using the BMS balancing protection board I would highly recommend that you buy the battery charger for the pack

                                    One note if the brand names of the battery packs are RYOBI or Milwaukee or Kobalt I can tell you what brand name batteries are in them and they are a safe bet as long as you have have voltage on the battery pack but I still would want to open them up to see the condition of the battery cells

                                    I hope this helps you
                                    Last edited by sam_sam_sam; 12-25-2021, 02:58 AM.
                                    9 PC LCD Monitor
                                    6 LCD Flat Screen TV
                                    30 Desk Top Switching Power Supply
                                    10 Battery Charger Switching Power Supply for Power Tool
                                    6 18v Lithium Battery Power Boards for Tool Battery Packs
                                    1 XBox 360 Switching Power Supply and M Board
                                    25 Servo Drives 220/460 3 Phase
                                    6 De-soldering Station Switching Power Supply 1 Power Supply
                                    1 Dell Mother Board
                                    15 Computer Power Supply
                                    1 HP Printer Supply & Control Board * lighting finished it *


                                    These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                                    1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                                    2 Hem Saw Computer Stack Board

                                    All of these had CAPs POOF
                                    All of the mosfet that are taken out by bad caps

                                    Comment


                                      Re: Here is a good used source for 18650 batteries

                                      This is sort of a surplus store, so can't predict what they have. I also don't remember the brand name of the pack.

                                      The theory is that they're new but possibly a return, but that could also mean it was defective... At 24V it is a weird number, at 6S3P it would get close to 24V 6Ah with 2Ah cells, else it would be 6S2P with "3Ah" cells. I think it's more likely 6S3P but it's possible it has something other than 18650s in it. They were definitely "dense" as in heavy for its size - assuming the package isn't lying and they put lead acid cells in them, but there's no way to get 24V of lead acid cells in that small of a package..

                                      TBH I would not pay $1 for a used cell or even $0.50/cell for a bad pack (e.g. pay $4 for a dead 8-cell laptop pack?), but the chance these are good condition cells for a power tool made me think...alas it's still a gamble.

                                      Not sure if I can sneak a multimeter in to test, nevermind open, unfortunately.
                                      Last edited by eccerr0r; 12-25-2021, 02:56 AM.

                                      Comment


                                        Re: Here is a good used source for 18650 batteries

                                        Originally posted by sam_sam_sam View Post
                                        Here is a very very good deal I have yet to see a battery below 2.50 volts and few I have tested I got at 2200 milliamperes hours

                                        I had ordered 30 of them

                                        https://batteryhookup.com/products/3...cells-with-pcb

                                        I just ordered 40 more
                                        Here is a picture of the battery in question I still have a lot of batteries to process I have only done about 30 of them and I still have over 100 more of to test but have not had time to do I have been testing other batteries but I might get back to them soon I hope

                                        Unfortunately they are out of stock on this item and I have not seen it return yet

                                        The results are looking at the graph and where the voltage is at 3 volts is where I getting this value from not the total amount of milliamperes hours that when it reaches 2.8 volts as the SkyRc IMAX b6 tester shuts off at which is when it is at 100 milliamperes
                                        Attached Files
                                        Last edited by sam_sam_sam; 12-25-2021, 02:01 PM.
                                        9 PC LCD Monitor
                                        6 LCD Flat Screen TV
                                        30 Desk Top Switching Power Supply
                                        10 Battery Charger Switching Power Supply for Power Tool
                                        6 18v Lithium Battery Power Boards for Tool Battery Packs
                                        1 XBox 360 Switching Power Supply and M Board
                                        25 Servo Drives 220/460 3 Phase
                                        6 De-soldering Station Switching Power Supply 1 Power Supply
                                        1 Dell Mother Board
                                        15 Computer Power Supply
                                        1 HP Printer Supply & Control Board * lighting finished it *


                                        These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                                        1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                                        2 Hem Saw Computer Stack Board

                                        All of these had CAPs POOF
                                        All of the mosfet that are taken out by bad caps

                                        Comment


                                          Re: Here is a good used source for 18650 batteries

                                          Here is some batteries that I bought a couple of years ago and they were a disappointment because they are not 3.3 amp hours like it says on them but they do not heat up but when I first bought them they never had much higher amp hours rating that they do now

                                          I will give them to someone who is interested in them just pay for the shipping I think I have 3 or boxes of them but there is only 6 to a box if remember correctly

                                          Just PM if you are interested in them I do not want them to go to waste if someone else can use them the outside cover does not come with them however but they will be individual wrapped to not short out and I will test them to make sure that you do not get any that are DOA
                                          Attached Files
                                          9 PC LCD Monitor
                                          6 LCD Flat Screen TV
                                          30 Desk Top Switching Power Supply
                                          10 Battery Charger Switching Power Supply for Power Tool
                                          6 18v Lithium Battery Power Boards for Tool Battery Packs
                                          1 XBox 360 Switching Power Supply and M Board
                                          25 Servo Drives 220/460 3 Phase
                                          6 De-soldering Station Switching Power Supply 1 Power Supply
                                          1 Dell Mother Board
                                          15 Computer Power Supply
                                          1 HP Printer Supply & Control Board * lighting finished it *


                                          These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                                          1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                                          2 Hem Saw Computer Stack Board

                                          All of these had CAPs POOF
                                          All of the mosfet that are taken out by bad caps

                                          Comment

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