A:
It comes with a battery, so it doesn't need any initial charging. There is a On/Off switch on the bottom, so you just have to remember to turn it on to use it and turn it off after use, so it doesn't drain the battery.
I haven't had it very long, but from what I understand the batteries last quite a long time during normal use. My nephew has a similar mouse and his battery lasted well over a year and he uses his daily for school.