Tenergy 7.2V 2000 mAH NiMH Square Rechargeable Battery Pack for Walking Robots and RC Planes Made of 6 AA NIMH 2000mAh rechargeable batteries in 2x3 configuration Ideal Rechargeable Battery Pack for light weight walking Robot, RC planes (Hightec, JR and Futaba) and RC cars. NiMH technology enables convenient charging at any time. High power delivery with 3.5 Amp maximum discharge rate. Standard Dimension: 1.75 "Length x 2 "Width x 1.2 " Height (in inch)