The charger works fine - but you have to insert the battery the other way around, as you would do on the first intuition. Especially because the incorrectly inserted battery same time a green LED lights up, from which one might assume that they want to tell you that the device works with no problems. Sure, if you then close attention to the position looks contacts, you also know how you have to insert the battery. Then first illuminates a red diode when has finished loading, the green.