I had/have the same problem. I replaced the battery that a friend at Philips set me and it worked fine for a couple of months. It has started once again doing the same thing. I feel it is the charging circuit over charging the battery. I now por id down when I am not using it.

I have no info on where to get the battery and If anyone else does I would like to know that, at least the mfg (other than Philips) and model of the Battery or a compatible unit.

The USA service depot for Philips is Service Wide Technolgy. Just google them. I think they quoted me about $100 to replace the battery, but as I said, I think it is a circuit problem, which translates to bigger bucks. Let me know how you make out.