My Gateway E-475Mt laptop has a battery (3rd one so far) that I can install a new one, get the thing to 'learn' the battery (charges, discharges, then recharges thru bios menu) and will indicate 'fully charged'. BUT, after a few months the battery discharges fully - yet the laptop says 'fully charged' - when I remove the battery and check the built-in charge indicator on it, it says it is dead - plug it in and laptop says fully charged. I can remove battery while adapter plugged in and laptop runs so adapter is fine. I can shut it down and cut power (unplug adaptor) and it will keep bios setting for short time off, but when I shut down over night and cut power to adapter, its bios resets to default losing time settings and passwords (bios battery a bit weak probably but not the main problem - main battery should be keeping bios powered when unplugged and not be running on bios battery). With a new battery all is fine and it keeps bios settings overnight or for days while unplugged, but after a few months the battery drains, yet is 'charged' according to windows and linux and laptop indicators... when first boot, indicator light is red (chargng) for a few seconds then goes to blue (charged) as it boots up. Gone thru three batteries so far with this - each lasting a few months. I can try to 'learn' thru the bios with the dead bettery but it says battery is fine without going thru the charge-discharge-charge process. Charging circuit malfunction? I have to leave adapter connected to power constantly now.