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For caravan movers, it's often more advantageous to use lead-acid batteries due to the higher currents required to move a heavy caravan. For propulsion of a whisper boat, a lithium battery is better because it's very lightweight. This allows you to travel further with the same capacity. These aren't the only factors to consider, of course; many factors play a role in choosing the right battery with the right capacity and voltage. If you have any questions, please don't hesitate to contact us!