Is it ok to repace a 300mA tablet battery with a 3000mA one

I want to replace my 300 mA Chinese tablet battery with a 3000mA new one, My old battery has 3 wires red , black and White, the white one connect ta a point in tablet board named "T".. what is this wire for ? My new battery has only the black and red wires .. can I just ignore the white wire and connect the black and red wires.. Is there any thing I must do after replacing the battery , like reset the tablet?! Thank you very much .