X10 mini, charging all night kills battery

Hi, X10 mini. Charge it for an hour or two, all is good but if I charge it all night, in the morning the phone is dead with no charge in the battery. Have tried another charger. :confused:

via Welcome to gsm-tips http://forum.gsmhosting.com/vbb/f778/x10-mini-charging-all-night-kills-battery-1749202/