I have a XPS M1330 with a 9-cell battery running Windows Vista Home Premium SP2 32bit (standard Dell issue) with A15 Bios. I have noticed few problems recently -
1. The battery shows a full charge but when AC power is disconnected the laptop switches off in about 5-10 minutes abruptly.
2. On checking the power indicator gauge (post the abrupt switching off of the laptop) - it still shows 4 Lights on. After pressing the battery gauge for 3 secs all lights turn off and turn on again when the gauge is pressed again. Therefore the battery still seems to be charged and also working properly (no blinking lights or alternate lights on).
3. In spite of all effort I am unable to discharge the battery beyond the one light.
4. I also notice that battery charging is stuck at 91% (a few days back it was getting stuck around 85%). This remains in this condition even if I switch off and charge the laptop.
5. The laptop seems to work fine on AC power only. Checked the charging voltage and that too seems correct at 19.5V
6. Have reflashed the Bios to A15 (latest).
What could the problem be? Do I need a new charger, A new battery or both? Or is there something else wrong.
Any other diagnostic suggestions?
Does the system BIOS recognize the AC adapter, or is it listed as "unknown"?
Yes, the AC adapter is recognised as "standard 65W charger". The BIOS also has an option to enable reporting of faults with the charger which I have enabled. Haven't received any alerts on the charger.
Suspicion is that the battery is bad but I am foxed as to why it shows 4 lights on in the battery gauge? When I pull out the AC power I see 2-2.5hrs of charge left and then suddenly the laptop powers off.