Help with charging a rechargable Li-Ion Battery Pack

[xMeckii]

Hello, just a quick question if someone could help with an answer. I am in need of charging a 18650 Li-Ion battery pack, but short notice and needed before a hobby charger would arrive for me to use. So I am looking at using a variable power supply to do so but wanted guidance before doing this as I wouldnt want to overcharge or use the wrong voltages/currents.

The pack I am using is a 18650 quad battery, 14.8V 2.6Ah, 38.48Wh rechargable battery pack. I know that the usual voltage for Li-Ion batteries are 4.2V and 1A if I am correct to charge a cell, followed by stopping when the current reaches 1 tenth of an amp (100mA), but would this be the case for a battery pack as all the videos I see are for just one battery instead of multiple.

Any advice would be appreciated as I need the pack charged within the next day or two.

The following image is the only type of data I could find on RS components for the battery pack i purchased.

 

[IRstuff]

Yeah, you already know the answer to that, don't you? You're likely to start a fire with that.

https://www.digikey.com/en/maker/bl...s popular cylindrical,current drops to 50 mA.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

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[3DDave]

I think there are two things to monitor that will go wrong otherwise.

The first is that setting a constant-current value means 100% having to watch the voltage. Even a short time above 4.2V per cell at constant current will likely start a fire.

The second, the 4.2V constant voltage phase is useful for the topping off; avoiding that topping charge might be enough to avoid problems at the loss of a small capacity loss.

Can the power supply be set to shut down at 4.1V ? A constant current of 1A seems OK; but 100% that 4.2V cutoff isn't negotiable, so stay back from it and accept a lowered charge until a proper charger arrives.

If you cannot guarantee that cutoff, find a fire-proof container for the battery while it charges.

In this video on li-polymer cells, they manage a fire, and they said with the charger it was tough, because the charger has timers and current detection and voltage detection; if you only have current control and the power supply keeps ramping up the voltage above the 4.2V cutoff then be prepared for:

https://www.youtube.com/watch?v=PAX_-WljkzQ

 

[Handess]

thanks