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have a Nokia N73 with charging issues. Had the phone sent to me from the UK with battery at about 1/2 charge. Used it for a bit then put on charge, charging indicator came up, left it on charge overnight. In the morning I couldn't power up the phone and phone was in black. Bought a new 'tested' battery, the phone power up fine and worked for a couple of days. When I had to charge it and I plugged it in, charging indicator came up the same problem occured.
Tested ac adapter (8.2 volts) with no load. Tested battery connectors on phone end going into the battery with ac adapter plugged in meter showed 1.02 volts. 'New' dead battery reads 2.9volts.
Seems to me as if you're frying the battery and the phone.
Ericsson T10i -> Nokia 7110 -> Siemens C45, C55, M55, M65 -> Nokia 6131, N73, N82 -> HTC Wildfire, Desire HD -> Nokia Lumia 800 -> HTC Desire X -> Lumia 820 -> Sony Xperia SP -> Lumia 925 + Sennheiser CX 500 If I've helped, use the Kudos button to thank