Final point, it's better to let the battery absorb some juice before you start using it, i.e. don't try to both use it and charge it when the battery is empty. In practice that means that when you have unpacked it for the first time and you're impatient, you should still give it alt least twenty minutes or half an hour on the charger before you turn it on. If you just can't wait the full two hours to get to a full carge. (After that, just keep charging it (even while using it) as soon as you get the chance. These batteries are happy to be charged often and they intensely dislike a deep discharge.)