Energizer Extreme AAA HR03 Rechargeable Batteries 800mAh (4 Pack)

The Energizer Extreme AAA HR03 is a pack of four pre-charged nickel-metal hydride (NiMH) rechargeable batteries, each rated at 800mAh capacity and 1.2V output. The batteries arrive charged and ready to use, eliminating the need for an initial charge cycle before first deployment. The 800mAh rating positions them for mid-to-high drain devices that require consistent power over extended periods rather than brief bursts.

Designed for devices that consume power steadily—wireless gaming controllers, digital cameras, portable audio players, cordless phones, remote controls, LED torches—the batteries hold their charge for up to 12 months when stored at room temperature, meaning they remain ready for deployment even after long periods in a drawer. The NiMH chemistry allows them to be recharged hundreds of times without developing the memory effect associated with older nickel-cadmium cells, making them a practical alternative to single-use alkaline batteries in devices used regularly.

Each battery measures 44.5mm in length and 10.5mm in diameter, fitting standard AAA battery compartments across consumer electronics. The pack includes 15% recycled materials in the battery construction as part of Energizer's wider material-use strategy. The pre-charged state means the batteries can go straight into a device on arrival, with no charger needed until the initial factory charge is depleted through use.

How many times can these batteries be recharged?

Energizer Extreme NiMH batteries are designed to be recharged hundreds of times. The exact cycle count depends on usage patterns, discharge depth, and charger type, but typical use in consumer electronics will yield several hundred charge cycles before capacity degrades noticeably.

What charger do I need?

These batteries require a NiMH-compatible charger rated for AAA cells. Do not use chargers designed exclusively for nickel-cadmium (NiCd) or lithium-ion chemistry, as they may damage the cells or create safety issues.

How long do they hold their charge in storage?

The batteries retain their charge for up to 12 months when stored at room temperature (approximately 20°C). Storage in higher temperatures will reduce this retention period, while cooler storage can extend it slightly.

Are they suitable for high-drain devices?

Yes. The 800mAh capacity and NiMH chemistry make them suitable for moderate-to-high drain devices such as digital cameras, wireless gaming controllers, and portable audio players. They perform less well in very-low-drain applications like wall clocks, where alkaline batteries typically last longer between changes.