Hooked up to three Douglas Aquatroll batteries, the 2745A did its job admirably: In the initial bulk stage, the charger used its full output of 15 amps, which gave the batteries a 75 percent charge. Then it switched to the reduced current absorption stage and gently topped them off at 98 percent. The maintenance stage then applied a low, regulated voltage that prevented excess discharge and maintained the full charge. You can leave it on indefinitely without worrying about overcharging, and thanks to its speedy disposition-it brought three 12-volt batteries from 60 percent discharge to full charge in just four hours-you can get back on the water quickly after a long day of fishing. Price: $500. Contact Guest at 888/483-7865, www.marinco.com.