View Full Version : Batteries in parallel

07-09-2009, 05:01 PM
If you hook batteries up in parallel - (I have the Borg Werner key hot switch to isolate when the boat is parked) - how important is it that they be the same battery - I have a blue top Optima as a second, the cranking is the new Die Hard Platinum.

07-09-2009, 05:02 PM
From what I have read, you won't hurt anything, but will shorten the life of the battery.