Charge batteries that are in series without separating the cells?

Thread Starter

wall_

Joined Sep 11, 2013
44
How can I charge a 3S lithium battery pack without separating the cells?
I have 3 TP4056 linear lithium battery chargers but I don't have isolated power supplies.
 

bertus

Joined Apr 5, 2008
22,305
Hello,

This will only work if the input and output are isolated.
When the charger is not isolated, you will short the lower 2 batteries.

Bertus
 

dl324

Joined Mar 30, 2015
17,142
Or charge the batteries one at a time.

If the batteries are well matched, you can charge them in series. If they're not matched, the stronger batteries will kill the weaker one...
 

Thread Starter

wall_

Joined Sep 11, 2013
44
So i'll probably have to buy 3 cheap ferrite transformers. But is there a way I could achieve this from a simple usb charger?
 

Thread Starter

wall_

Joined Sep 11, 2013
44
Yes, I expected that, I know I need to isolate either the power supplies or the batteries.
Do you think I could trust this and this to do what I want?
 
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