High power – Tenergy’s rechargeable D size battery is designed for enhanced performance in high drain applications such as emergency radios, emergency lighting, portable devices, power tools, and more. Longer runtime – Tenergy’s high capacity D size NiCd battery has 5000mAh will give longer and more uses per charge. Generate energy savings – Rechargeable up to 1000 times, save hundreds of dollars by eliminating frequent purchases of one-time-use D Alkaline batteries. Standard D size - Replaces any standard D size alkaline batteries with measuring 60mm by 30mm. Rechargeable D battery – Easily and quickly recharge with any compatible NiCd D battery charger for usage whenever needed. Tenergy D size nickle-cadmium rechargeable batteries have 5000mAh capacity. ideal for high drain applications such as emergency radios, emergency lighting, portable devices, power tools, and more. Generate energy savings by switching to rechargeable D size batteries. Each battery can be recharged up to 1000 times.