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I have been away from this hobby for a long time, but got inspired to get this garage-sale find running. It is a Graupner Commodore, 1970's motor yacht, 70 cm long. It came with all radio, motors, batteries and all, everything works, except the batteries are really old. So I am thinking about replacing the batteries with Li-pos, but what size should I have? The motors in the boat are 2 Mabuchi 540s. Are there problems running brushed motors with Li-pos? Thankful for all advice! :)