The batteries last for a long time, and after a few months is nothing to recognize losses of charge. However, my old 1500mAh batteries 08/15 also not so extreme kept less. Particularly expensive are also not really at a price of 1.60. The 2 boxes are supplied in handy to stow the batteries. However, they are not suitable for permanent use, as the closure is difficult to open and is easily broken. Use the battery but in mouse, remote control and there is not necessary to change it anyway as often.