This is the DuraTrax NiMH 8.4V 4200mAh Onyx Stick Battery Pack
with Star Plug.

FEATURES: Ideal sport pack for cars, trucks and boats

INCLUDES: DuraTrax NiMH 8.4V 4200mAh Onyx Stick Battery with Star Plug

REQUIRES: NiMH compatible charger such as the Duratrax Onyx series
Standard Male and Star Plug (DTXC2209) if using the Onyx series
of chargers

SPECS: Capacity: 4200mAh
Number of Cells in Series: 7
Rated Voltage: 8.4V
Min. Discharge Voltage: 6.3V
Maximum Recommended Charge Current: 4.2 amps
Discharge Lead: 14AWG 2.7″ (70mm) long wire w/ Star Plug
Pack Dimensions: 6.1 x 1.8 x 0.90″ (155 x 45 x 23mm)
Weight: 16 oz (455 g)
Number of Welds per Connection: 6 spot welds
Cell Size: Sub-C