03962a Battery Charger

Greetings,

I'm building a rechargeable controller using the 03962a and charging through the main USB port on the board.

Where is the most appropriate to place the ON/OFF switch? I'd like the controller to be OFF when charging, however I feel that if I don't disconnect the battery from the 03962a, it may drain power over time? Somebody correct me if I'm wrong.

Any and all wisdom is appreciated greatly.