2S Lipo Battery Discharger / Balancer for small capacity batteries.
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Slowly discharges one cell of a 2S lipo battery, to help balance it and make recharging it quicker.
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- Printables
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- Creative Commons — Attribution — Noncommercial
I found sometimes my lipo batteries, took longer to charge when the cells were not well balanced. The charger repeatedly puts power into both cells then drains some current out of the cell with a higher voltage to try and reduce the voltage difference between cells. So designed this discharger to allow me to connect a 2s lipo and select which cell I want to slowly discharge to balance it first and make the balance charger's job quicker.
it's for use with small 2s approx. 350mAh lipo batteries and will drain the selected cell at about 250mA. To use plug in a small 2S lipo use the switch to select which cell to drain. Swich left for cell 1, or right for cell 2. the LED will light to show it's working. The switch centre position will stop the discharge and the LEDs will be off. Just a few minutes should be long enough to reduce the cells voltage by a few 10s of millivolts. Disconnect the battery and retest the cell voltages, put back on the discharger if necessary.
I built it using the following components:
30 x 70 double sided fiberglass pad board. x 1
JST-HX 3 pin socket x 1
Red LED x 2
1N4148 signal diode X 2
100R 1/4w carbon film resistors X 7
3-Position ON-OFF-ON Miniature Toggle Switch x 1
The wiring diagram images show the front and rear wiring. Anything on the other side of the board to the view, is shown in green. Once built test it well, before connecting a lipo battery!