Replacing CX5 OEM battery with a Group 35 AGM equivalent

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Pueblo county CO
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CX-5 Sport 16.5 6M
AGM could become chronically under charged but using a battery tender should remedy this.
 
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2017 Mazda CX-5 Touring
Alternators are also kind of smart and charge is controlled. One can easily verify this by monitoring the obdii live data.
Modern alternators are controlled by the ECU to achieve smart charging. CX-5 ECU monitors battery "state of charge" and load to control alternator voltage for a flooded lead acid battery. If you install an AGM battery, the ECU doesn't know it; it still uses the charging profile for a flooded battery. Yes, many have installed AGM batteries in their CX-5s and it seems to work. I'm just saying it is not optimal.
 
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CX5 GT
I dont have details on whats programmed in the ecu but my observation js that all works well with my AGM so far.
Much better than the Oem flooded one for my driving style and car usage. Last time I didnt drive for a month the oem almost died. 2 yrs old battery. Obviously my car usage was bad for the battery.


Below is current test from my AGM, 6+ mo old.
I barely drive the car and its usually short distances 6-7 miles and more importantly is the time - 15-20 minutes from start to stop. Once every few weeks longer time and distances.

This below from my tester. So far it seems to work well for my needs.
Whether it would last 5 years I dont know. Probably not.
Only time will tell, but I do have full replacement for the 5 years so that works for me.
Also additional benefit is it heats less in Arizona summer heat because of the special casing on the battery. And yes I verified oem and this with ir thermometer.

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this is the oem when it was dying although it probably had 1 more year of life left because we dont get very cold weather here.

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hmw

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2016 CX-5 GT AWD / Tech & iActiveSense
Below is current test from my AGM, 6+ mo old.
I barely drive the car and its usually short distances 6-7 miles and more importantly is the time - 15-20 minutes from start to stop. Once every few weeks

That’s actually what my driving is like now, thanks to the Pandemic.

What AGM battery did you use and what tester is it?
 
Side bar question: Has anyone used a portable lithium power charger to jump start their CX5? My battery now 2 years old and am thinking of buying one as preventative measure.
 
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CX5 GT
That’s actually what my driving is like now, thanks to the Pandemic.

What AGM battery did you use and what tester is it?
X2 Power by Northstar group 35.
From Battery plus. Its probably overkill for cx5 but there were some nice discounts and rebate in the summer. The price came about 200 usd which was a bargain to me for that battery.

The Duracell Platinum AGM (made by East Penn) from the same site is also good battery with 4 yrs full warranty.

But as I mentioned any new battery is ok and better than an old battery :)

The tester is foxwell bt100 car battery tester from Amazon.
Topdon bt100 is also good and that one has cranking stats. Obviously both are chinese ones but do its job for home use
 
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CX5 GT
Side bar question: Has anyone used a portable lithium power charger to jump start their CX5? My battery now 2 years old and am thinking of buying one as preventative measure.

Cx5 petrol can start easily by anything. Its very 'light' 4 cyl engine.
So I am assuming it should work as long as it has the right juice available - i.e Amps
 

hmw

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2016 CX-5 GT AWD / Tech & iActiveSense

hmw

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2016 CX-5 GT AWD / Tech & iActiveSense
The dealer tested the battery today after charging $100 for running diagnostics on the EPB and battery. Apparently the battery tested 140 SAE/CCA so it's one foot in the grave

They quoted $250 + labor for a new battery and cautioned me against doing it myself - saying that there's DTC codes that need to be cleared after the replacement else I'd have a dash full of malfunction lights. The hint was that coming to them after replacing the battery myself would be very costly.

With all the folks who have changed batteries - did anyone get these dashboard warnings? And if so, is it possible to clear them without going to a dealer?
 
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2019 Mazda CX-5 GT Reserve
The dealer tested the battery today after charging $100 for running diagnostics on the EPB and battery. Apparently the battery tested 140 SAE/CCA so it's one foot in the grave

They quoted $250 + labor for a new battery and cautioned me against doing it myself - saying that there's DTC codes that need to be cleared after the replacement else I'd have a dash full of malfunction lights. The hint was that coming to them after replacing the battery myself would be very costly.

With all the folks who have changed batteries - did anyone get these dashboard warnings? And if so, is it possible to clear them without going to a dealer?
I'm not sure about the CX-5 but I swapped the battery in my son's 2016 Mazda 3 and everything was fine. No lights, no warnings. Around $175 for a Diehard AGM & 15 minutes of my time.

$250 + labor for a battery seems extremely steep.
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
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Plano, Texas, USA
The dealer tested the battery today after charging $100 for running diagnostics on the EPB and battery. Apparently the battery tested 140 SAE/CCA so it's one foot in the grave

They quoted $250 + labor for a new battery and cautioned me against doing it myself - saying that there's DTC codes that need to be cleared after the replacement else I'd have a dash full of malfunction lights. The hint was that coming to them after replacing the battery myself would be very costly.

With all the folks who have changed batteries - did anyone get these dashboard warnings? And if so, is it possible to clear them without going to a dealer?
You should have just spent $79 getting a new battery from Costco instead of paying $100 to the Mazda dealer for some “diagnostics” on such a simply “problem”. You can always read the code and test the battery for free at any auto parts stores like AutoZone.

Since you have a 2016 CX-5, your EPB could have dragging issue which may trigger the EPB warning light. There’s a TSB for it and the resolution is a pair of revised rear disk calipers.

TSB R052/16C: Noise from REAR BRAKE/Trace of Rear Brake Dragging
 
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Charlottesville
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2016 CX-5
Side bar question: Has anyone used a portable lithium power charger to jump start their CX5? My battery now 2 years old and am thinking of buying one as preventative measure.
I've used one especially this year due to Covid. I'm not driving my car much and I've had to jump it with a portable battery starter at least 3x. Worked perfectly. I got it as a gift but I think it's worth purchasing
 

sm1ke

Work In Progress..
Moderator
Contributor
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Canada
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'18 CX-9 Signature
The dealer tested the battery today after charging $100 for running diagnostics on the EPB and battery. Apparently the battery tested 140 SAE/CCA so it's one foot in the grave

They quoted $250 + labor for a new battery and cautioned me against doing it myself - saying that there's DTC codes that need to be cleared after the replacement else I'd have a dash full of malfunction lights. The hint was that coming to them after replacing the battery myself would be very costly.

With all the folks who have changed batteries - did anyone get these dashboard warnings? And if so, is it possible to clear them without going to a dealer?

As yrwei52 mentioned, you could have had the battery load-tested for free at an auto parts store.

I don't think there are any codes that are guaranteed to appear from a battery replacement. That dealership was just trying to scare you into paying for services you don't need. Avoid that dealership for any future service, if possible.

Buy a new battery from Costco and replace it yourself. Instructions for the 2.0L engine can be found here. The process should be similar for the 2.5L engine.

Codes can be cleared with an OBDII reader. Again, most auto parts stores can do this for you for free, or you can buy an ELM 327 OBDII bluetooth dongle online, then download a free app (Torque) to your phone and clear the codes yourself.
 
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2019 CX-5 GTR
Side bar question: Has anyone used a portable lithium power charger to jump start their CX5? My battery now 2 years old and am thinking of buying one as preventative measure.
I have, my battery died during quarantine, to point power locks did not function and no interior lights. Used the battery booster and started right up. Had battery checked and everything was good, this was back in May.

I have Noco Boost GB40. It has a safety function, so if you mix up the polarities or accidentally touch the boost cables together, you went get any surprises. One thing to be careful of is leaving the booster in your car, especially during hot summer months.
 
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13' CX-5 and 16' Mazda6 both Touring w/Tech/Bose
One thing to be careful of is leaving the booster in your car, especially during hot summer months.

Do they work? Yes. Should I store in car? No!!!!! Mine died while stored in car in the summer. Heat kills them.

Store it in your office, home, or other cool location.