It may be the charger problem, As web master said some of the local charger is not so reliable. That's why we go for "much More" or "LRP" changer. I do recommend to borrow another hi-end charger to test it.
Oh no, why i am so unlucky, i bought the battery from 極X in KWS, you think i can take it back for exchange or what?? I think the battery is really dead since the even i plug the battery for LED light, the light goes off within 10 min , and the charger is new, so do i need take all to 極X and let them check??