Thread: Battery dead?
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Old 06-02-2020, 03:02 PM   #1
FC
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Join Date: Oct 2003
Carmudgeonly Ride: M5 / 718 GTS / Cooper S / GTI / LR4
Location: Metro Boston
Posts: 25,215
Battery dead?

Miata battery seemed dead out of the blue yesterday. Jumped it with the LR4 with no problem. Let it idle for a few minutes (we were going somewhere) and shut it off. Today, once again dead.

New jump, this time with a bit more effort and got it going. Drove for an errand about 25 minutes of very spirited back roads and high speed driving. Got there, went in for 5 minutes and again car would not start when I got back. Had to get a jump. Same return drive home.

Voltage after shutting it off when I got home = 12.05V
Voltage after 1 hour = 11.85V
Voltage after 2 hours = 11.80V

The battery had a couple of episodes of being drained early on. It (Duralast Gold) was bought a couple of years ago because I thought the previous battery was the issue, but it turned out to be loose connections. That's not the case now. Everything is tight.
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