I have the same problem with my M52. So i tried to fix it but there is no way out. I bought a new battery but that didn't helped. Doing the same problem, might be something with the charging. I think the battery won't charge. I think this because i put another battery from my old phone and it turns on, only for a second. I plugged the charger and show that charging(with the old phone battery) also for a second. There is no problem with the phone instead. Maybe something with the production of the battery or i don't know... yet.
If somebody have an opinion or a resolve, please answer as soon as possible ;)