so did the battery you say you bought fix it ? what that red light usually means is that it needs to be charged for awhile before the phone can even load up the charging screen. So, if you still haven't solved it, try leaving the phone charging for a longer time and see how it goes.
Sony Ericsson T290, W200, C510, P1i, C902, X1, X2, X10, X12, R800, MK16
Motorola Milestone, Droid 2 Global, Droid 3
HTC Touch Pro, Aria, Merge
LG eXpo GW280