Compact dinghy engine start battery

When upgrading to a larger electric start outboard, we needed a compact battery capable of starting the engine. The Odyssey AGM PC 545 measures only 7x5x3 inches and weighs 11 lbs. It can be mounted in any orientation. While it's primary use is motorcycles and watersports, it can crank up to a 100 hp outboard. Several vendors make an aluminium mounting enclosure to fit the battery.