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#21 |
Solder Sloth
Join Date: Nov 2012
City & State: CO
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 7,080
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![]() Lead acid batteries need BMS too...
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#22 |
Badcaps Veteran
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 3,467
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![]() Your right about this but finding the right one is the issue and most of them are not designed right either they over charge over time or they do not charge enough and leave battery at 70% and not at 95 to 98% which would be better
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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 ![]() All of the mosfet that are taken out by bad caps ![]() |
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#23 |
Badcaps Veteran
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 3,467
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![]() Well Electronic Goldmine brought back these again and I bought four of them to try out on the battery stud welder
Eaton PowerStor® XL60 3000 Farad 2.7V Supercapacitor XL60 a 1/3 cost of brand new one from Digikey https://www.goldmine-elec-products.c...?number=G24175 Last edited by sam_sam_sam; 12-03-2021 at 08:02 AM.. |
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#24 |
Badcaps Veteran
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 3,467
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![]() Well I just bought one of these battery packs because now I have a way to test this type of battery pack
https://batteryhookup.com/products/2...v-power-module But I going to turn this in to two 20 volt battery packs instead of the setup that it is right now For the battery operated air compressor that I had bought several months ago One note they have sold out of them several times before |
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#25 | |
Badcaps Veteran
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 3,467
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![]() Quote:
I have tested a few of these for this pack and they seem to have around 90% life left in them for batteries that have a date code of 2015 on them They are suppose to test at 8 amp hours but are testing at around 7.0** to 7.1**something amp hours The discharge curve looks good until it reaches the 3.45 volts and drops faster than I would expected it to be it should drop at lower voltage maybe closer to 3.0 would be a lot better This discharge curve looks pretty decent for it age still a lot of life in it I tested one for 5 minutes @8 amp load on the testing machine and the results were pretty good at 8 amp load Last edited by sam_sam_sam; 01-02-2022 at 07:41 AM.. |
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#26 | |
Badcaps Veteran
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 3,467
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#27 |
Badcaps Veteran
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 3,467
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![]() Well I have tested about half of them and the results are as follows
6800 to 7*** something these batteries are not quite as good as the signal double battery pack cells are but I can still use them but a little disappointed that they are as good and have found that some of the battery cells have a self discharge issue which is going to add to how I group these batteries to make a battery pack |
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#28 |
Solder Sloth
Join Date: Nov 2012
City & State: CO
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 7,080
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![]() hate cell variation, alas not much can be done about it ...
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#29 |
Badcaps Veteran
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 3,467
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![]() Yeah I know all I can do is group them the best that I can and the ones that have a bad self discharge rate maybe use a couple of them for solar lighting around my shed and maybe in the font yard I have a few solar panels that I could use for this project
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