My HP celeron laptop, about 15 months old, is suddenly unable to start unless plugged into the mains. When it is, it says the battery is 96% chared with 11 hrs of unfeasible battery life. Once then disconnected, it still runs, though not sure how long for. Shut down, and the battery charging light blinks frequently,but the laptop won't start at all. What do hyou think has happened? If the battery has gone I think this is poor for a HP machine and will try to get them/and/or the vendor to replce even though what was a 12m warranty has expired.