Hello. We are looking at this item to buy. However, there is an issue for which I'm finding several opinions. I'd like to know if anyone knows from personal experience, the answer. The Owner's Manual suggests NOT listening to this radio during charging, either using the USB or and AC charger. Problem is, it states it'll take 16 hours to charge. Just wanting to know if anyone has one, and whether they find it's safe to charge it while powered on. Thanks!