This is the Great Planes ElectriFly Power Series
Lithium Polymer 2100mAh 11.1V 20C Battery Pack with Balance Connector.
Ideal for Sport Aerobats, 3D Trainers, and Scale.

FEATURES: Balancing allows all cells to fully Charge to 4.20V 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

INCLUDES: Great Planes ElectriFly Power Series Lithium Polymer 2100mAh 11.1V
20C Balance Battery Pack with Discharge lead with 12AWG 3.1" (80mm)
long wire with Dean's Ultra Female Plug and 24AWG 1.6" (40mm)
Charge lead with Balance Connector and instruction sheet

REQUIRES: Great Planes Equinox Cell Balancer (GPMM3160) or equivalent or
charger with balancing capability

SPECS:    Capacity: 2100mAh
Number of Cells in Series: 3
Rated Voltage: 11.1V
Max. Charge Voltage: 12.6V
Min. Discharge Voltage: 7.5V
Maximum Recommended Charge Current: 2.1A
Continuous Discharge Current: 42A (20C)
Discharge Lead: 12AWG 3.1" (80mm) long wire w/Deans Ultra Female Plug
Charge Lead: 24AWG 1.6" (40mm) long wire with Balance Connector
Pack Dimensions: 104 x 36 x 29mm (4.09 x 1.42 x 1.14")
Weight: 6.14oz (174g)