This is the Hobbico HydriMax Ultra NiMH 4.8V 4200mAh Sub-C Flat Receiver Battery Pack. FEATURES: Ideal for large aircraft with multiple digital servos Sub-C size cells with six welds per connection INCLUDES: Hobbico HydriMax NiMH 4.8V 4200mAh Sub-C Receiver Pack with Universal connector with gold plated terminals REQUIRES: Charger SPECS: Capacity: 4200mAh Number of Cells in Series: 4 Rated Voltage: 4.8V Min. Discharge Voltage: 3.6V Standard Charge Current: 420mAh for 11 hours Discharge Lead: 20AWG 5.9" (150mm) long wire, Universal connector with gold plated terminals Pack Dimensions: 93 x 47 x 24mm (3.6 x 1.9 x 0.95") Weight: 285g (10.05oz) jxs 5/31/06 EEW 8/10/06