Marine Batteries

[MasterBaiter]

I think leaving a charger on all the time depends on the battery and charger. Lead/acid batteries would boil away and ruin the battery with your typical charger. You would need one that would switch to a "maintain" type setting after full charge. I use an isolator between my 2 and the engine seems to do a good job of keeping them charged.

As far as type of battery, I use Sears DieHard lead/acid. They are not expensive, I have had good luck with them in my vehicles, and everywhere I trailer it there is either a Sears or Kmart for an exchange if there was a problem.