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Topic: Lithium battery question [2x 3.7v with one control board] (Read 1 time) previous topic - next topic


Apr 07, 2013, 02:04 am Last Edit: Apr 07, 2013, 03:15 am by boriskourt Reason: 1

Any ideas how I would charge this one? It puts out 7~ volts, so they must be in series.  I have this basic charger for 3.7 lipos from sparkfun: https://www.sparkfun.com/products/10217 but I doubt that it will work with this one.


EDIT: tested the voltage between the COM and B port and it is ~6, I guess just the serial output of the two.


You could charge it with a small current and a maximum voltage of 8.4 Volts (8.3V is better, for safety).


Depending on the specifics of the circuit, you could get away with using a 7.4V Li-Ion charger on the pack leads. But, if the circuit board doesn't have balancing features, you'd need a balancing charger.

Doesn't look like there's any balance taps on that thing from what can be seen in that image, and the circuit board doesn't seem to have any power resistors it'd use to dissipate balancing power. I'd thoroughly examine how the pack and board is supposed to work (or not work, if it's just plain bad design), or examine the datasheet to find out what features the board has, and how the manufacturer intended for the pack to be charged.

Or, you could just charge with a current-limited 8.2-8.3V powersupply and replace the pack before it becomes too damaged from it and catches fire :)


What is the control board you are using to connect the batteries in series?  How well does it work powering your arduino?

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