Quote:
Originally Posted by takomaned
If you're unable to see the + - markings on the battery, the positive post will be slightly larger in diameter than the neg. post
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A lot of batteries are poorly marked. I bought a white out pen at the dollar store and use that to paint the + and - marks white. The white out pen is actually like a ball point pen with white paint, so be sure to shake it well before using it. The paint dries in seconds.
I use the white out pen to mark a lot of things which are poorly marked. I marked the electric fuel pump IN and OUT and the + and - terminals on my friend's fuel pump the other day.