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Discussion Starter #1
Does anyone know if I can use just any deep cell battery. I was thinking of getting a yellow top optima to replace mine.

Mazda dealer says it will not work.
 

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You need a Q85 Battery, you should be able to find one for 350 with ship.

If you get a deep cycle they may not warranty this should it fail though. But go ahead and try it because I've heard a number of folks getting normal batteries with the car and it dying in a year or two because the factory put regular ones in because they didn't have any stock in the q85 and it died two years later.
 

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Discussion Starter #3
Many people have said a deep cycle battery is a Q85 battery. I just need to know if someone has done this.
My battery is not dead yet. I have a Optima battery in my truck that is 12 years old. I would rather get a battery for $250 that last 10 years than a $400 battery that last 3.
 

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An Optima Yellow-Top or Bosch AGM battery should work fine. The Q85 battery is nothing special, it's just a crappy "enhanced flooded lead-acid battery"; it's basically between the regular starter batteries and the high-end AGM batteries like the Yellow-Top and Bosch in performance. The AGM batteries are specifically rated for Start-Stop systems and the systems like i-eLoop.

Your dealer disagrees because they want to sell you a $400 battery.

Just don't put a regular starting battery in there; that won't work long-term. That's probably what those people who had bad experiences did. The AGM batteries are around $200 at parts stores, though you might get a better price on Autozone.com's website for the Optima.
 

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Discussion Starter #5
I got my answer!!

This is direct from the manufacture.

""""""""""""""""""""""""""""""""""""""""""""""""""""
Good Afternoon Micheal

Thank you for your recent inquiry.


The deep cylce battery is used to run accessories and not start your engine, the Q85 is idle stop star battery.

I hope this helps answer your questions. If you have any additional questions please no not hesitate to contact our team on 1300 361 161 or by responding to this email.

Enjoy your day.



If you have any additional questions please do not hesitate to contact our team on 1300 361 161 or by responding to this email.

Enjoy your day and I look forward to your response.
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""


I do not have the start stop feature on my 2014 Mazda 3 with I-Eloop. I will be getting the Yellow top Optima battery. These things charge fast and that should exceed the performance of a Q85 battery.
It should work better for the I-Eloop system than the factory battery.
 

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Hey guys .... I would like to know if OP's did in fact use a yellow top battery as replacement ? Did it work ? I am currently going through this same issue in my 2014 3 with I eloop ( don't have start stop )
 

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I know this is an old thread but my daughter's 2015 GT is indicating its time for a new battery. Has anyone verified that a regular AGM battery will work? Can someone specify which exact batter brand/model you used? The nearest Mazda dealership is 90 miles away and Id rather pick up a battery locally at Autozone/Advance/Orielly's or order something online. Thanks
 

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Trying a Duralast

I just ‘bit the bullet’ and installed a Duralast Platinum battery (AGM) in my 2015 Mazda 6 GT w I Eloop last night. Got 4 years and 87k miles from first battery. I’ll try to remember to update in a few months w whatever happens.
 

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You can use the Northstar NSB-AGM-35 batteries, or the X2 SLI35AGMDP battery from Batteries plus. They will warranty it the same as a car without i-eloop. Which is 4 years for the Northstar and 5 years with batteries plus and it's a full replacement rather than pro rated. BTW, I bought the Northstar with my paypal account. Northstar technically makes both of these batteries. They also made the sears platinum batteries once upon a time.

I have i-eloop on my mazda 3 2014, and I haven't had a lick of battery problems since the replacement about 12 months ago. The lights even dim less at start up still to this day.
 

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It's wonderful that other batteries are working and starting your Mazdas. But I'm loathe to use something other than the Q85. It seems if a AGM or other deep cell was appropriate, Mazda would have used that.

Considering that the i-eloop uses a trick alternator, large capacitor, and special DC-DC converter I don't want to do something that would compromise any of those very expensive parts in the long run.

So I'm going to bite the bullet and pick up the Q85 from the local dealer for $350.
 

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I have done additional research and have found what many have said - that AGM are better technology and are generally considered an upgrade to EFB. Great write-up here:

HOWEVER... I also found this information here:

Flooded (Wet Cell)
Maintenance: Maintenance Required
Type: Flooded
Cycle Life: 250-500 Cycles
Duty Cycle: 50% DOD
Typical Charging Voltage: 14.4-14.5 Volts

Enhanced Flooded Battery (EFB)
Maintenance: Maintenance Required
Type: Sealed Lead Acid (SLA)
Cycle Life: 500-1000 Cycles
Duty Cycle: 60% DOD
Typical Charging Voltage: 14.4-14.5 Volts

Absorbent Glass Mat (AGM)
Maintenance: Maintenance-Free
Type: Sealed Lead Acid (SLA)
Cycle Life: 400-600 Cycles
Duty Cycle: 80% DOD
Typical Charging Voltage: 14.7-14.8 Volts

The EFB has a much higher cycle life than the AGM. I also learned that the trigger for the activation of the maintenance light in the Mazda is the number of cycles the battery has been subjected to. I have no idea what that number is. If it is 500 or so, than an AGM would be fine. However, if it is upwards of 800 or so, the AGM would be subjected to many more cycles than it is capable of. What are the implications of that? Premature failure? Damage to i-eloop components?

The Q85 EFB battery is expensive for sure; over 2X the equivalent AGM battery. But I got 5 yrs and 45,000 miles from the Q85 which is a pretty solid lifespan.

Thoughts?
 
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