GL Class (X166) 2013-2015 after facelift became GLS (X166)

Battery Questions

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Old 05-16-2020, 04:47 PM
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So it's been a bit and, for anyone looking in future, wanted to note that the car has been doing fine. I learned:

- A voltage of high 14s while car it running is ok with these cars

- Batteries seem to go quick on these cars relative to others (just an impression I got looking around at posts here and elsewhere).

- A car battery can go bad within 18 months...part of my issue was that I assumed there was no way the battery could have been bad that soon

- When testing a battery, don't test it right after charging it up. Turn on headlights for a couple minutes without engine running to remove the 'surface charge' (someone called it that), then test. I kept seeing the battery in a perfectly fine range, but once I let headlights run for just 2 minutes it dropped pretty quick..apparently that's a good sign of a bad battery

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