This is an Onyx 8.4V NiMH 5000mAh Sub-C Stick Battery with a Standard Plug.
Cell Size: Sub C
Number of Cells in Series: 7
Rated Voltage: 8.4V
Discharge Wire Gauge: 14AWG
Discharge Wire Length: 4.9" (125mm) not including
1x Onyx 8.4V NiMH 5000mAh Stick Battery with Standard Plug
NiMH compatible charger such as the Duratrax Onyx series