I found this chart on the specifications for my AGM battery in my 400. It seems to be a similar representation to a table I have found on here relating voltmeter readings to % charge on the 320 batteries. So I thought this might help someone else with a 400. This battery is the Vision battery EVDD-240A-AT. I mention that because apparently they don't all have the same exact battery, although the supplier of the batteries appears to be Harris batteries. If I'm way off and this is totally not what I'm thinking it is, someone let me know and I'll delete it!
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That image should be resized for more comfortable viewing..even on my desktop it took a bit to load.
Read over this thread for the "guidelines" and I'm sure someone will help if you need it.
http://tab-rv.vanillaforums.com/discussion/47/what-size-should-my-posted-forum-photos-be#latest
T@Bit@t 2015 S Max Outback, ‘18 V6 4Runner