A Guide to Traxxas' Batteries and Chargers — Roger's Hobby Center
charger - How to solder two 3.7 V LiPo batteries in series and then balance charge them - Electrical Engineering Stack Exchange
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15 things every LiPo battery user should know - The Drone Girl
Charging 2 x 3S Lipo's in series: please look over my schematic - ESK8 Electronics - Electric Skateboard Builders Forum | Learn How to Build your own E-board