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Message: <blockquote data-quote="bubbagumper6" data-source="post: 7438508" data-attributes="member: 567719">No, they don't have to be the same battery.  Some will tell you this will shorten the life of them if you don't use an isolator, however I've never used one and I'm still using the used yellowtop I bought over 4 years ago so take that as you will....Adding a second battery will put more strain on your alternator but the problem isn't necessarily adding the battery it's the underlying problem of you drawing more power than what your alternator can produce.  If your just running that 1200 and 300 (1500w total?) you're on the brink of needing an aftermarket alternator.  Depending on the stock size you could probably run it for awhile with the two batts but then you run the risk of totally killing the alternator at some random point in the future which will leave you stranded without a car....</blockquote>

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