Eneloop batteries have a low self-discharge rate and they are pre-charged and usable immediately after purchase like dry cell batteries. The new eneloop battery continues this tradition by using SANYO’s original “super-lattice alloy” for negative electrode material and improvement of materials and structure, a fully-charged “new eneloop” battery can maintain approximately 75% of charged power even after 3 years, ensuring that power is available when needed. The new eneloop batteries are pre-charged in Japan by “green power” from photovoltaic generation. This means that a part of the electric power used for manufacturing (the amount equivalent used for factory pre-charging) is generated using clean, renewable solar energy.
Having invested and used reputable Powerex 2700mAh batteries for a couple of years, I’ve found their high self discharge rates to be high maintenance. For this reason, I switched to Eneloop and have found their low self discharge to not just save time but these go much further between charges thereby reducing the frequent recharging required.