I have a Zareba battery charger that I use to run my poultry net that I use for my chickens. It is designed so that it can be used with either D cellbatteries which fit inside, or a choice of 6V or 12V batteries which can be externally connected. Right now I am using D cells, but would like to convert to 12V. I've heard that marine batteries are best, but have also heard the same about golf cart batteries. Anyone who has used either, please fill me in on your experience. Specific model information or specs would be helpful too. For those of you who use this kind of battery, how do you connect it to the fence? Something along the lines of jumper cables, or what? I hope to get a battery this weekend, if I can figure out the right kind to buy. Thanks.