Doing a full power down does ensure RAM is fully wiped but this shouldn't be necessary for most modern OS's.
I don't want to make a bigger deal out of this than what it really is, but why not follow a few simple recommendations from the manufacturer? These include, but are not limited to:
1. Fully charge while powered off prior to initial use
2. Use the charger provided with the phone
3. Reboot daily
Motorola and other manufacturers know these devices better than any of us. It is in their best interest, as well as ours, that we enjoy our experience using them.