Pages: [1]   Go Down
Author Topic: Lithium battery question [2x 3.7v with one control board]  (Read 512 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 7
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset




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.

Thanks!


EDIT: tested the voltage between the COM and B port and it is ~6, I guess just the serial output of the two.
« Last Edit: April 06, 2013, 08:15:54 pm by boriskourt » Logged

Offline Offline
Edison Member
*
Karma: 58
Posts: 2078
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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

Offline Offline
Newbie
*
Karma: 0
Posts: 2
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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 smiley
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 1
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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

Pages: [1]   Go Up
Jump to: