I've had my Tab for about 10 months. A couple of days ago, I thought I'd run the battery down. But I could not get the device to recharge. I'd plugged into my work computer's usb. Didn't take a charge. My car charger: wouldn't take a charge. I'd even left it plugged in for 24 hours to my home computer, but still no luck. The solution: charge in on the Samsung USB charger. As you probably know by now, the Galaxy Tab needs a 1.5 amp USB power supply to charge at full speed. It will charge slowly on a 0.5 amp USB power supply as long as the device is powered down. And it will run without depleting the battery as well, but will not recharge. One more wrinkle apparently: if you totally discharge the battery, then you will need to charge it on a 1.5 amp charger instead of a 0.5 amp charger. Kinda relieved. I thought I'd lost it.