4 pack of Tenergy Premium rechargeable 9V batteries designed for durable performance in high drain applications (i.e., R/C controller, detector, transmitter, and other portable high drain digital electronics). No memory effect; battery does not require drainage before a charging and be recharged up to 1200 times. Exact replacement for standard single-use alkaline 9V rectangular size battery. Advanced NiMH technology provides longer use-time per charge with high capacity of 200mAh. Each battery measures 48mm x 26mm x 16mm and include 12 month warranty period. Features and Benefits * High quality 9V rectangular size rechargeable Nickel Metal Hydride (NiMH) battery. * Advanced NiMH technology provides longer use-time per charge than other rechargeables with the high capacity of 200mAh. * Exact replacement for standard 9V rectangular size battery. * Designed for durable performance in high drain applications (i.e., R/C controller, detector, transmitter, and other portable high drain digital electronics). * Can be recharged more than 1,000 times, which can provide big savings when using rechargeable batteries. * Convenient operation without memory effect; battery does not require drainage before a charge. * Dimensions: (H x L x W): 48mm x 26mm x 16mm. * Weight: 1.6oz per cell. * Batteries tested based on International Electronic Commission (IEC) standard to ensure capacity, quality, and life-span.