2015 e4
2018 Deka Gel battery #8G31
OLD owner let them die completely a few times in the PAST.
After charging all night voltage is as follows
1Battery 13.20v
2 Battery 12.93v
3 Battery 13.27
4 Batter 13.32
5 Battery 13.28
6 Battery 13.29
Check them again after they have been sitting for 4 hours or so.
Also helps if you have a load tester.
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those are fine . now run it around for 5 miles and then check them . then go 5 more miles and check again . this will tell you if you have a bad one.