Size or quantity doesn't matter,just one of any type will work to keep you in battery. BUT,you need to keep them in your left front pocket if you are a right handed shooter. Left handed,best to use a rear pants pocket. Either way,remove before doing the laundry and using the dryer.

Now if you are making it go out of battery on purpose and just complaining (or don't even own one). A 9V works best after you complain (doing it by hand), if you put your tongue on the +/- end of the 9V. That works better yet to help just quit doing it.