One of the nice things about a Windows phone is that you can take the battery out and put a replacement in. This is useful if the battery breaks, or runs down. And you can get spares really cheaply. These people are presently selling a pair of batteries and a charger for the unbelievable price of £7.90. I’ve no idea how long they will last, but they seem OK at the moment. For less than the price of a music CD they seem a good deal to me.