RustyNav09
Member
what do you want ot use the battery for. You can get cheap RedArc Isolators which will do the job just fine or you can go to a more expensive step charge liek the RedArc BCDC1220 or the Ctek D250S. Remembering an Isolator will only charge the second battery to 80%ish once the cranking battery has been charged to 100% by the alternator.