This maintenance-free 45-pound nickel-zinc battery provides 150 amp-hours of run time for your trolling motor at 12 volts, the equivalent of two 60-pound lead-acid batteries. Completely sealed in a heavy-duty marine-plastic case, the battery can be recharged over 600 times and comes with an unconditional three-year warranty. It even has a built-in charger (just plug it into a 110-volt outlet for a full charge in less than seven hours). The dimensions are 13 inches long by 7 inches wide by 10 inches high, and the price is now just $449. From Evercel, 877-383-7235; www.evertroll.com.