Removing battery acid from a flashlight?
Flush with lots of water, neutralise with weak solution of sodium carbonate.
Don't forget to take into account whether or not it is from an alkaline battery. If so, you may need to neutralize with a weak acid rather than a base. Inquire further on another site. -Matt
Just one. A "battery" is a collection of "cells." A lead-acid cell has a potential of 2 volts (well, a little over 2v but that's not critical right now), so to get 12v out of a lead-acid battery you need to build one with six cells. So...one "battery" consisting of six "cells." (In case you're wondering, a "flashlight battery" is really all the cells in the flashlight put together.)