Great Planes ElectriFly Power Series Lithium Polymer 3350mAh 11.1V 25C Battery Pack with Balance Connector. Ideal for bigger sport aerobats, 3Ds, and scale electric flight.

Balancing allows all cells to fully charge to 4.2V ensuring maximum power from the pack, plus conditions the cells better so they will last longer. Unique power technology offers high energy density, low weight, long life, safe operation, and environmentally friendly chemistry.

Great Planes Equinox Cell Balancer or equivalent or charger with balancing capability