The batteries

Like their predecessors, the fourth überzugt Gerneration the Eneloop batteries with rich performance and reliability. The capacity of 1900mAh is reached and slightly exceeded. Unlike batteries, which want to stimulate with high capacity figures for sale, lose that "low self-discharge" batteries not just a few days a lot of their charge, but are easily used even after many years.

In principle it is the same battery as before, with the difference that this now 2100 loads to endure. Since this can not comprehend in practice (it would eventually 40 years lifetime with weekly charge), you have here Panasonic (who now incorporated Sanyo) trust. Rather, anyway the user will affect the battery life, because even after a deep discharge they can be completely useless. Spent batteries have to be necessarily reloaded before storing. It should also be ensured in the charger - if possible - a charge current of at least 1/3 of the battery capacity, here ca 700mAh, set so that the charging circuit detection of the charger is working properly. Otherwise, the batteries could be significantly overloaded and slowly destroyed by the resulting heat.

Conclusion:
The lower price of batteries bring these batteries quickly back inside and save the environment. Whether 3rd or 4th generation, it will not make a big difference, take the quiet cheaper.