@zalho do you remember way back when the Apple iPhone 3G and 3GS came out? There was such a debacle about the battery numbers since they were assumed to be interchangeable etc. but it created a lot of "odd" errors. determination was then made that they are really not interchangeable. So, if the working battery is a BN53 and the others are BN52 and don't work, get a new BN53 and try it.