Must Used a Smart Spektrum Charger To Charge Battery
Using the wrong charger for any battery can have serious consequences, including: 
  1. Damage to the battery
  2. Reduced battery life
  3. Failure to fully charge
  4. Overheating and potential fire or explosion

Spektrum RC 3S 30C LiPo Battery Pack with JST Connector. This LiPo battery pack is designed to work with E-flite UMX airplanes requiring a 3S battery. Package includes one LiPo battery pack.

Specifications:
Battery Type: LiPo (3.7V per cell)
Battery Voltage: 11.1V (3S)
Capacity: 300mAh
Connector Type: JST-RCY
Discharge Lead Length: 2" (51 mm)
Maximum Charge Rate: 0.9 Amps (3C)
Maximum Discharge Current: 9 Amps
Maximum Discharge Rate: 30C
Length: 1.65" (42 mm)
Height: 0.7" (18 mm)
Width: 0.74" (19 mm)
Weight: 24.5g