Sanyo 'ECO Charger' packaged with 4 x Sanyo HR-3U NiMH batteries. A premium quality charger with top quality batteries. The NiMH rechargeable batteries included with the Eco Charger when used in heavy drain devices such as digital cameras will last about 2 to 3 times as long per charge compared to using an alkaline battery is then thrown away when dead. Once discharged you can recharge the Sanyo HR3U batteries up to 1000 times which is many more than the higher capacity (2300, 2500 & soon 2700mAh) NiMH batteries which are only good for about 400 recharges, and much less for cheaper brands. This means that if you use alkaline batteries it will result in about  4000-6000 batteries which will end up in the land fill instead of just four of these batteries when they finally reach end of their life. We think you will agree that's very Eco friendly!