Batteries can be used immediately after purchase or up to an industry-leading*4 five years after previous charge*1, thanks to resistance to self-discharge.

All batteries will naturally self-discharge, meaning that the amount of energy stored within will gradually decrease. Nickel hydride batteries and other conventional rechargeable batteries tend to demonstrate faster self-discharge than dry batteries, causing inconvenience to the user as the batteries need to be charged before they can be used after purchase, and cannot be used when needed after a period of storage. However, eneloop offers significantly improved resistance to this self-discharge to provide immediate usability after purchase or long-term storage – thereby offering similar levels of convenience to dry batteries. Following a full charge, the batteries will retain approximately 70%*6 of their maximum energy level after five years of self-discharge, making them perfectly suited both for everyday use and for emergencies.

*6  Estimated energy level with self-discharge during storage at room temperature (20°C) under IEC61951-2 (7.3.2) testing conditions following a full charge.

Realized an industry-leading*3cycle life in the industry, which makes eneloop the most reusable, thanks to improvements to materials used for positive electrodes

Thanks to improvements to the materials used for the positive electrodes, the new eneloop standard model (AA-size, AAA-size) can be recharged up to 2,100 times, a 16% improvement on the previous models (HR-3UTGB, HR-4UTGB: Approx. 1,800 recharges*2). This makes it one of the most reusable batteries in the industry*3 for an AA-size and AAA-size standard model.

Meanwhile, the "eneloop lite" entry model can be recharged approximately 3,000 times*2, a 50% improvement on the previous models (HR-3UQ, HR-4UQ: Approx. 2,000 recharges*2).

Improved repeated recharge technology * For standard model

Improvements to the conductive layer of the positive electrode active material surface, made chiefly from nickel hydride, have allowed for greater conductivity and durability. By limiting the degradation of the conductive layer, it has been possible to reduce performance degradation during repeated use and thus increase the number of times the battery may be recharged – all without increasing the amount of negative electrode alloy used.

Lineup features three different types: standard, high-end, and entry

Three different models – an eneloop standard model, "eneloop pro" high-end model, and "eneloop lite" entry model – will now be developed under the Panasonic brand. The high-capacity rechargeable battery previously marketed as "XX (double X)" will now be relabeled as "eneloop pro". The standard eneloop model demonstrates little self-discharge and can be used with all manner of equipment. The high-capacity "eneloop pro" is suited for heavy users and equipment consuming a lot of energy. Finally, the "eneloop lite" is designed for equipment that do not consume much energy, and/or equipment that require particularly frequent charging.

A unified, elegant design has been used for all three models to help promote their global development.

Other characteristics

• "Tradable Green Certificate": solar energy used to charge batteries before shipping*7
• Offers long-life, stable voltage supply from beginning to end
• Strong against cold temperatures; can even be used at -20°C*8
• Can be recharged safely after partial discharge; no need to worry about memory effect
• Charger with Smart Charge function launched at same time*9 to detect charge status of each individual battery and prevent overcharging

*7  Japanese "Tradable Green Certificate" system used to cover energy used to charge batteries before shipping by generating an equivalent amount of "Green Energy" through solar power.

*8  Battery lifespan will be shorter than at room temperature. Equipment operability is not guaranteed.

*9  Excludes certain regions.

eneloop: specifications

eneloop: Chargers