Originally Posted by BBSuperAbuser
Your device is not really "off". It is in a standby mode, and will continue to drain battery life.
Posted via BlackBerryForums.com Mobile
While true, it's beside the point. The device should not drain an almost full battery overnight in this state.
It is a puzzle. I don't know the answer. However, what the OP is doing is reasonable. He (or she) shouldn't have to put the device on a charger as a work around. I'm like the OP, I would want to figure out what's going on.