I would just recommend that you get a lamp timer with the wheel o'little notches, and not the type with the slide thingys. I started out with one that did the sliding on/off things, and it wouldn't always turn off like it was supposed to. Used it for about 2 weeks before I got the one with the little notches/levers/switches that you push down. Been using one of those for over a year, never had a problem. So you can still overnight charge Contained, but you just need to do it safely
This is like the one I use. Has the power plug in the front instead of on the side like some, makes more room for the USB adapter.