DrewE wrote:
pianotuna wrote:
charge them. disconnect the positive posts. reconnect in spring or first trip.
It's better to disconnect the negatives.
Electrically it makes no matter either way, as an open circuit is an open circuit, no matter where it's open. However, it's generally safer to connect the negatives last and disconnect them first as accidentally shorting the wrench to the frame won't cause a short circuit that way. If you're undoing the positive with the negative still attached to chassis ground, hitting most anything metallic on the vehicle can easily result in a very, very hot wrench very quickly.
Good advice! Keep in mind that ruining the battery is not the only side effect of a spark nearby....those things can explode and cause severe personal injury and property damage! ALWAYS disconnect the NEGATIVE cable first and reconnect it last.