Currently undergoing testing as an ambassador for envy, I test for several days the Duracell charger 4:00 and the 4 AAA batteries and AA4. What is very original in this charger c is that you can charge two battery types at a time and no need to clutter with s several chargers for charging 4 AA and AAA batteries 4. The charger is simple and sober and Tres very simple to use and it plugs into a wall outlet and not very easy to plug it into a multi socket as too broad, this charger is equipped with a red light and obviously the red lights green flashes when there is a charging error and turns green when charging is completed and batteries are ready al employment. After charged batteries, they are of considerable autonomy because it is already seven days that the batteries are in the pilot of my son that I use day and night for his naps and the load is still maintained which is great. See how long they will remain without loading beings? It really is a profitable purchase, and very economic for environment and ecology Duracell very well respected its commitments. Long live the little pink bunny