Duracell AA HR6 Rechargeable Batteries 2500mAh (4 Pack)

Duracell AA HR6 rechargeable batteries use nickel-metal hydride (NiMH) chemistry with a 2500mAh capacity per cell, supplied pre-charged in a 4-pack ready for immediate use. Each battery operates at 1.2V nominal voltage and can be recharged hundreds of times in a compatible NiMH charger, providing a reusable alternative to single-use alkaline cells.

Designed for devices with moderate to high current draw including digital cameras, wireless game controllers, cordless keyboards, torches, and motion-sensor lights, the 2500mAh capacity delivers extended runtime between charges compared to lower-capacity rechargeables. The pre-charge from the factory means the batteries can be inserted into a device immediately on opening the pack, without requiring an initial charge cycle.

NiMH cells self-discharge more slowly than older nickel-cadmium (NiCd) technology, retaining approximately 80% of their charge after six months in storage when unused. The batteries tolerate operation across a temperature range from -20°C to 50°C, making them suitable for both indoor devices and outdoor equipment like garden lighting or wireless sensors. Each cell measures 14.5mm diameter by 50.5mm height, the standard AA footprint.

The 2500mAh rating represents the capacity available per charge cycle under controlled conditions at 20°C. Real-world runtime depends on the discharge current drawn by the device, ambient temperature, and the number of previous charge cycles the battery has undergone. Duracell recommends recharging these cells in a quality NiMH charger that monitors cell voltage individually rather than charging pairs in series.

How many times can these batteries be recharged?

Duracell rates these NiMH cells for hundreds of charge cycles. The exact number depends on how deeply each cycle discharges the battery and the quality of the charger used. Partial discharge and recharge extends cycle life compared to full discharge every time.

Do they come pre-charged?

Yes. These batteries are pre-charged at the factory and can be used immediately on opening the pack. They will still benefit from a full charge in a NiMH charger before first use in high-drain devices like cameras.

What charger should I use?

Use a charger designed for NiMH batteries that monitors individual cell voltage rather than charging batteries in pairs. Avoid using chargers designed for NiCd cells or generic chargers without cell-by-cell monitoring, as these can overcharge or undercharge NiMH chemistry.

How long do they hold their charge when not in use?

NiMH cells self-discharge over time when stored. These Duracell rechargeables retain approximately 80% of their charge after six months of storage at room temperature, which is better than older NiCd technology but slower than lithium primary cells.