Ask an automobile mechanic.

did he actually take the battery out to test it? if he tested it without taking it out i would disregard those results, the printout even says 'out of vehicle test' so the results will be inaccurate if it was not in fact out of the vehicle.

that said i am not aware of any way to determine state of health with a multi-meter, i have a cheap battery tester that i use on our cars, and 400 does seem low to me for a 625 rated battery, also check your battery for its actual rated (din) as i have seen people run the test without telling the tester what the expected rating should be.

If you are near union you can swing by and ill run a test with my unit while its in the car, takes <1 min (maybe 5 if the battery is buried in the trunk
 
Glenn Rides After 4 PM CST said:
I doubt they remove it or disconnected battery cables to test it.
Would definitely re check it.
They did charge it and test it again. Soc State of charge went up.

ALSO ITS TWO DIFFERENT BATTERIES. AGM AND FLOODED.
WHICH IS IT?
Someone doesn't know wTF they're doing.
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Yep he wasn’t sure of the battery type so they tested it both ways. I believe the Mazda batteries are flood
 
My experience has been that agms are installed in the cabin and flooded batteries are in the engine bay. Not sure if this is gospel or not but it's been my observation
 
shrpshtr325 said:
My experience has been that agms are installed in the cabin and flooded batteries are in the engine bay. Not sure if this is gospel or not but it's been my observation
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Not anymore. AGM are becoming more common. My POS Maverick has an AGM from the factory. Under the hood. And they are more sensitive to low voltage and short trips, etc. They apparently do better with the auto start/stop systems.
 
What has me puzzled is why it’s potentially needing to be replaced after only 28 months since new abt 32k miles of 50/50 highway/city. Does that seem feasible?

In comparison, my Xterra battery lasted 5 years at a time before I sold it last year. My M’s battery is 10 years old at 48k miles. My wife’s X3 battery is 6 years old and 78k. So far so good on those (knock wood).
 
icebiker said:
What has me puzzled is why it’s potentially needing to be replaced after only 28 months since new abt 32k miles of 50/50 highway/city. Does that seem feasible?

In comparison, my Xterra battery lasted 5 years at a time before I sold it last year. My M’s battery is 10 years old at 48k miles. My wife’s X3 battery is 6 years old and 78k. So far so good on those (knock wood).
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uncommon, but not impossible, batteries are like any other manufactured product, some on the high end of tolerance some on the low. Newer vehicles have a higher battery load due to all the extra electronics, start/stop ect ect. Average battery life is 4 years, but will vary based on all of the above and the amount of key on engine off time you have. You drive <1k miles a month, thats not really alot so it is sitting there draining in between, or worse yet (for the battery) you are doing alot of shot trips which dont allow the battery to reach a 100% SOC before the engine is shut off again (and lead acid batteries like to be as close to fully charged as possible)

your M probably sits on a battery tender when you arent driving it so thats good for the lifespan.
 
Batteries are a crap shoot.
We've had new cars with 10 miles fail a battery test at pre delivery inspection.
It's more common than you would think.
My Pathfinder is still rocking a 5 yo battery. I test it every oil change but have since started driving with a jump pack in my car.
 
Red Mosquito said:
Agree, I wouldn’t be too concerned about that battery. If it was me, the X3 at 6 years old would be getting a new battery preemptively. The winter is when they like to give up.
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We did that for the wife's X3. Not excited to learn that you can't just drop a new battery in the car as you need to get if programmed. Of course no one around here does that except the dealer. Not cheap. I think we paid over $500 total.
 
Bike N Gear said:
We did that for the wife's X3. Not excited to learn that you can't just drop a new battery in the car as you need to get if programmed. Of course no one around here does that except the dealer. Not cheap. I think we paid over $500 total.
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In all fairness I don’t keep up on cars other than the ones I own, but I’ve not heard of reprogramming for a battery replacement before. That sounds pretty ridiculous.
 
Red Mosquito said:
In all fairness I don’t keep up on cars other than the ones I own, but I’ve not heard of reprogramming for a battery replacement before. That sounds pretty ridiculous.
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i have a scanner that claims to be able to program a battery change (my wifes car needs it iirc) so will find out in a couple months if it works, if so ill have to start charging $100/ea and undercut the dealers 🤣
 
Red Mosquito said:
In all fairness I don’t keep up on cars other than the ones I own, but I’ve not heard of reprogramming for a battery replacement before. That sounds pretty ridiculous.
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It was a shock to me too. They call it "registering" the battery. I think they charged about $200 just for that. Supposedly not all electronic functions will work properly unless this is done. None of our local mechanics, nor AAA have the scanner necessary to do this but they all agreed it needed to be done.
 
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