Mine seemed to be mostly charged. I plugged them in and started using the PT immediately (because I'm an instant gratification kind of guy!) and noticed that after maybe 10-15 minutes the indicators on both showed them to be fully charged. I also got a third battery and grabbed it by mistake when I went out for the night (2 chargers, so it hadn't been charged at all) and it worked like a champ for the 3 hours I was out. At any rate, they are lithium ion batteries, so they don't have 'memory' problems other batteries do, so there's no harm in trying it out as soon as you open the package. I'd bet at least one of them is plenty charged to get you started while the other one tops off!