well, guys, i think the issue is the battery "memory effect", I have had a really similar problem with my xps 1530 battery. Overnight the battery stopped charging. I find it hard to believe its just died suddenly. when the laptop batteries were not full discharged(means the batteries not show 0% power), and then were charged, they will "remember" the latest power level as the full 100% power level, when you run them down and recharge them, they will show you 100% full charge as their "memory",but not really full charge.
so, you can over discharge them and than over charge the laptop batteries for 4-5 hours, the "memory effect" will disappear. If the problem is still exist,you should buy a new one and hope it can help you.