Sold for $15 shipped.
Spec:
Capacity: 1800mAh
Voltage: 3S1P / 9.9v
Discharge: 30C Constant / 40C Burst
Max Charge Rate: 2C
Weight: 194g (including wire, plug & case)
Dimensions: 137mm x 45mm x 16mm
Balance Plug: JST-XH
Discharge Plug: XT-60 Connector