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Two flooded or AGM batteries rated at around 200 Amp-hours combined will weigh in range of about 120 pounds, more or less. If limited to 50% depth of discharge, they can be replaced by one lithium battery in range of 30~40 pounds, depending on manufacturer’s rating and recommendations.
For rigs that are overweight to start with, every bit helps. And for newer motorhomes attempting to eliminate the generator and are therefore installing as much as 600 Ah of lead batteries, switching to lithium would save even more weight — although at even higher incremental cost.
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