The chargers are the same so no way it is causing this.
Have you entered any software or changed some settings?
If not your 8800 is defective and needs to be replaced if removing the battery did not help. Be warry of some IM programs that use alot of battery power checking for IM.
I love it when peiople load their devices up to capacity or past and wonder why it is not working. I am not saying that this is you but if you have not added alot of software you ned to return it as mine and others are running well.