TayTay,

A 'tender' or 'maintenance' charger is fine for an ATV/UTV, motorcycle or seldomly driven vehicle. In all those applications your using starting versus deep cycle batteries and you're putting the vehicle into storage with a fully charged battery.

But, our boating and audio applications tend to mirror those of fishermen using several deep cycles and a trolling motor. So, follow the example they set as this group has been more on top of battery and charging technology for a very long time now.

Its not just about the recharging time, its much more about the recharging method. You need a higher current dual-bank multi-stage smart charger to chemically excite depleted deep cycle batteries in order to desulphate and properly condition. As a result you'll get longer play time at rest and your batteries may last a season or two longer.

Rule of thumb is your charger's total current capacity should be at minimum equal to your batteries' total amp/hours. I recommend a 12 to 20 amp dual bank charger with a 'distribute on demand' feature.

Here's some links.

http://www.earmarkcaraudio.com/Xcart...cat=261&page=1

http://www.earmarkcaraudio.com/Xcart...cat=261&page=1

David
Earmark Marine