Lipo batteries made by ThunderPower / FlightPower among others come with TP balance leads - you can use this 30cm / ~12 inch extension cable to give you more length to put the batteries inside a lipo sack while charging -or- you can chop them up and fabricate your own parallel balancing adapter.

This listing is for (1) 3S TP Balance Wire Extension Adapter with 30CM (~12in) 22awg Wire - 1 side male / 1 side female. 

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Please ask any questions prior to purchase.

Thanks for looking! Chris.