The 5 Symptoms of a Failing Battery!

[@acidfusion6969]

Great info! Thanks for the valuable reminders!

[@8020Media]

A - Thanks for the feedback! Hope it helped.

[@ZX81-c3u]

I have a 2018 GLE 400 still running on its original battery. The MBUX command shows the battery at 14.7V when the engine is running and gradually drops to 12.1V when the ignition is in position one. There are no starting problems, but I’ve noticed that the auto start-stop feature hasn’t been engaging lately. I know there’s an auxiliary battery as well, but I haven’t checked its status. Could this issue be related to the main battery, or should I focus on the auxiliary one?

[@8020Media]

Z - We have a Mercedes GLC 300 and the same thing was happening. Replaced the battery and it was fixed.

[@ZX81-c3u]

@@8020MediaThank you

[@MyLifePlus_3]

Tried to crank my van yesterday afternoon. Wouldn’t turn over and no ac or radio. The night before I sat at my son’s practice in van cranked with AC on for a couple hours…do you think that killed the battery?

[@bdj1335]

Yes that will definitely do it, Ive flatlined my fair share of batteries by doing that. The alternator charges the battery but if the engine isn't on the battery is the only source of power for the car, at least that is the case for older cars (think pre 2015 give or take). So your issue most likely is a drained battery, you might not need to buy a new one call your nearest auto parts store (advanced auto parts, autozone, etc.) and ask them if they test and charge betteries, majority of them do for free. The issue would be transportation to and from the store because the best way to charge a battery is overnight on a trickle/slow charger.

[@MyLifePlus_3]

@@bdj1335 my van was cranked, it was idling with AC on. But just sitting for a couple hours, not moving and I drove it home after the practice. Just wouldn’t turn over the next day. I haven’t tried jumping it off yet. Hopefully it will crank with a jump so I can take it to an auto shop and test the battery.

[@8020Media]

M - Keep us updated! We also have a video on the alternator that may be helpful: kzbin.info/www/bejne/fnyzYqmBqK6lask

[@8020Media]

B - Thanks for taking the time to assist a viewer! We appreciate it.

[@MyLifePlus_3]

@@8020Media well, I had my alternator replaced 3 months ago. So I was pretty sure it was the battery. Took it to Advance Auto Parts on Saturday and their little machine said it was the alternator, so of course I took it to my mechanic. He said it was the battery. Replaced the battery yesterday and seems to be running fine…just wondering why Advance said it was the alternator. ??? Praying it is ok and the battery will be the only problem.

[@singhbrijinder]

one more, start the car with multimeter check the voltage on battery terminals, if its not near 14v means alternator is bad.

[@8020Media]

Singh - Thanks for sharing this insight. We break this down a little towards the end.

[@khumokwezimashapa2245]

My battery is failing on my w204 C180 K from the signs you've mentioned, but it's still okay I guess. If I go more than 3 days without starting the car it won't start. It will still turn on when in the 2nd turn sequence, but won't start. I still plan on changing it soon, before it becomes inconvenience.

[@8020Media]

Khumo - You can always buy a voltmeter to make sure it is actually the battery. But based on the symptoms you've described, it's certainly a bad battery.

[@khumokwezimashapa2245]

@@8020Media I actually took it to a shop to test it. They said it was still okay to use, but a replacement was recommended and not necessary. I'm still gonna get tdhat voltmeter though. It's a very useful tool

[@8020Media]

Khumo - Great! Thanks for sharing your experience. For the cost, it's great to keep in the garage!

[@TIIRONC5H]

I have 1 year buy golf 4 tdi But in Winter i notice thiss issue i park car overnight ant in morning dead battery this continues until 6 days ago now i just left park it 10 min battery goes dad instantly after Do u think its Battery issue ?

[@8020Media]

D - Certainly possible!

[@Jaded6911]

Long story short. Car died. I have lights. Wants to crank but doesn't. Jump just fine. Had battery tested. Meter says 648 (not sure if that's good or not. Battery says 640-800) but they said the battery is good. Cranked just fine then too. Got home. Not alternator but range is between jumping between 12-13. Seems a little low according to video. Cranked again just fine. I'm so confused. Going to let it sit overnight and try again in the morning. Sounds like battery but I guess a starter can fail at any time.

[@8020Media]

J - Keep us updated! We also have a video on the starter that may be helpful here: kzbin.info/www/bejne/jH2ud5tqf6ytn9E

[@Jaded6911]

@@8020Media it was the battery. Finally read bad in the "zone" parking lot.

[@8020Media]

J - Thanks for keeping us updated! Glad you got it figured out.