I use these charger/maintainers to maintain heavy duty batteries when they are not in use. (For golf cart, trolling, and RVing use.) With one per battery, I have several of the older transformer units and of the new units which lack the transformer. Left unattended for the summer, a 36 volt unit from another manufacturer electrolyzed off all the water. I spent days refilling and recharging, and recovered only some of the batteries. The older Schumacher units did not electrolyze any water, and the batteries were ready for use. I was skeptical of these newer, lightweight units. Additionally, I was worried that there was no 6V/12V switch as on the older design. The great news is so far, they work well for either voltage. They are a great redesign. My only complaint is that the 3/8 inch bolts on golf cart batteries do not fit the 1/4 inch holes, preventing permanent installation. Until I can get the thin tabs drilled out (need to be careful, as they grab the drill bit), I use the included alligator clips. GOOD PRODUCT, GOOD PRICE
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