Lithium-ion batteries are half as heavy as lead-acid batteries and last three times as long. Unlike lead-acid batteries, they deliver full voltage until depleted, keeping the ride snappy. Ultimately, compared to AGM batteries, lithium-ion batteries prove comparably priced per hour of boating. In our tests, we've found 16- to 20-foot pontoons can enjoy a silent sunset cruise for hours or give a zippy ride to the sandbar for a day of water fun. And while you may think electrics are all slow-going, we've enjoyed some exciting rides and even water-skied behind electric-powered runabouts, and the horsepower to do it with pontoons is definitely available.