Not sure if this is relevant, but I've been overhauling my Mini, moving to Lithium. (200ah Lifepo4). It is definitely a different beast, with pro's and cons. You won't be able to use the existing Powermaster system, as it doesn't handle the charge voltage and cutoffs correctly. (You'll damage the battery.) In my case I rewired from the ground up, (as part of a bigger system that integrates Solar and a 50A feed from the car's alternator.) You'll also need to make some small adjustments to be on Lithium's slightly higher voltage as well, like a 12v converter to your propane detector, which maxes as 12.5v. Though other things like the fridge actually run better on the higher voltage. Happy to elaborate as needed.
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