G.T. Power 3-in-1 Battery Checker, Balancer and Discharger for LiPo and LiFe
Another "must have" tester from GT Power products. This three in one tester will show the detailed voltage of all battery cells at one time, allow you to safely discharge your battery pack before putting it in storage, and it will balance your battery pack which helps promote long life and speeds charging time.
Features:

Designed for Li-Polymer and Li-Fe batteries
Measures battery voltage precisely and balances cell voltage in pack
Discharges battery for long time storage

Specifications:

Dimensions: 93.5x60x17mm (3.7"x2.4"x0.67")
Battery Type and Amount: LiPo and LiFe 2-6 cell (7.4-22.2V) Receiver Battery (1.2-8.5V DC)
Balance Voltage Setting Range (lower limit): 2.0V-4.2V (pre-setting value 3.3V)
Discharge Voltage Setting Range (lower limit): 2-4.2V (pre-setting value 3.9V)