Com3,
You could use your existing battery tender for a lithium batt if you put it on a timer so it only runs a few minutes per day. This would effectively eliminate overcharging damage. The Shorai-specific maintainer with cell balancing technology is pretty trick and restores full capacity after a season of motorsport. It's around $80.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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