Greetings to all members of the forum, I have 5 pieces of lenovo G50 batteries, new in their boxes, that have fallen into sleep mode, because of 6month storing in my warehouse. Their voltage should be around 14.4V, but they measure from 3.9 to 5.85V each one and cannot charge either by laptop circuit or the special battery charger I possess. I think that my only option is to give the batteries some more voltage for a short period of time, trying to wake them up. if somene has developped a steady method with good results, I would be happy to learn from him.
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Seing is Believing
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Re: How to wake up laptop battery
A battery being discharged that much is not a good thing. The BMS should turn off the MOSFET when reaching the UVLO threshold too.
Anyway I've had success just plugging negative and positive side to a voltage and current regulated supply. For example for a 10.8V battery I set it to 11.1V and 1 or 2A and let it charge a bit. Then I finish charging with the computer.OpenBoardView — https://github.com/OpenBoardView/OpenBoardView -
Re: How to wake up laptop battery
Not sure what the lower threshold is. Probably 3V per cell so you need to charge it with more than 12V (3V*4 cells). After it has charged to above that, laptop charging circuit will be happy to take over.Comment
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Re: How to wake up laptop battery
Thank you very much for your replies, after a lot of troubleshooting involving manually charging each battery by making holes each side, I 've just managed to increase the Voltage back to normal levels 12-14V, but their capacity cannot be increased. Factory says there is a damage on the cells themselves and not a deep sleep of the circuit, but I don't trust them a lot. Thanks again for your help.Seing is BelievingComment
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Re: How to wake up laptop battery
Try using laptop to charge them fully (maybe while laptop is powered off). Then disconnect charger (, turn on laptop) and let it discharge until laptop shuts off. Then charge once again. It should let the battery controller know of the real capacity of the cells.
Not sure if it helps but it's worth a try.Comment
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Re: How to wake up laptop battery
when charging u must be very gentle. if your voltage a enough higher than voltage of battery, the battery controller unplug battery from charging, u see it as voltage raise on psuComment
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Hello Everyone!
I have an Acer Aspire A315-42 laptop. I generally leave it on for long time by closing down its lid (so it enters the sleep mode). Recently, it rained quite heavily in out area. And the humidity and moisture seem to be high. So one late evening, after I opened the lid and turned on the laptop, it did power on as the blue light turned on but after it booted to the desktop screen, just 5-10 seconds after both the screen and blue light went out and laptop shut down (the blue power light turned orange). And after 2-4 seconds that orange light went off and the laptop died....06-28-2025, 02:57 PM -
I have acer laptop tmx314-51 with part no 6050A3020501.
The laptop is working fine on adapter and battery is also charging and when adapter is disconnected in on state the laptop gives backup on battery and gives good backup.
But when laptop is powered on through battery only the laptop does not power on and there is 0 voltage on battery connector.
I have not not tried another battery as it is not available locally could this be a battery problem.have checked discharging mosfet and there is no shorting to ground on any pin of battery connector.
The schematic is not available... -
I have had with regular AA batteries that leak this meter is expensive new I already replaced the battery battery clips once and the same thing happened again and I am tried of so it is getting modified to accommodate lithium ion batteries that are the same size excluding the positive terminal and removing the battery clips I will have enough room for the BMS protection board
I going to put 3 lithium ion battery in parallel with the BMS protection board and a way to charge the battery externally and heat shrink the battery pack and use a JST connector so I easily remove the battery... -
Hello! I am fixing a Toshiba Satellite C55-A-142 (model no PSCG8E).
It came with an old battery. Laptop was rebooting every 5 sec with black screen, not even entering BIOS. If battery was removed it worked perfectly only on charger. I thought it's a shorted battery so I ordered a new one.
Now with the new one it wont even reboot, but the red battery light is blinking on the laptop. Pressing the power button does nothing. Laptop still works with battery removed.
So to summarize:
1. there is no short
2. Laptop starts only with battery disconnected.... -
The bq24745 bq24745RHDR bq24745RHDT is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm x 5 mm QFN package.
The bq24745 features dynamic power management...10-23-2024, 02:50 AM
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