From what I understand, you can float charge a 12v sealed lead acid battery at 13.6v indefinetly. And, from what I gather, the quickest you can charge float charging is 8 hours or so, I'm ok with that as I'm fine even with 24 hour charging. Here is the question, does it matter how many ma the transformer I'm using is? I was going to use a 300ma and it will be charging a 3.2ah battery, but if I use a larger transformer, would that be a problem? Also, can I use this style of float charging to trickle charge a car battery?