The battery voltages the rx200 shows are way off though. It tends to show much more voltage difference than what the batteries are actually at.
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I agree with that, but having confirmed a >0.2 Volt difference in one cell with a Voltmeter multiple times, charging via the mod, it isn't "way off" in the sense that it shows completely different Energy readings for just one cell, while the other two are consistent.
....At least in my case. Hardware is version 1.3, updated by manufacturer to software version 3.0, with its box sealed.
Ballpark is better than being out of the stadium..
But it's best to have meters in our line of "work."