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Old 07-12-2018, 09:33 PM
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darcyw darcyw is offline
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NC Miata battery issues

Hi Miata owners.
I have an acquaintance who has an '07 Miata owned since new, with less than 50K kms. She says after winter storage, she can't start the car. The dealer tells her to replace the battery. Battery replaced, the car starts. She is getting tired of this. I asked if she puts a battery tender on it and she said she has.

this does not make sense to me unless the battery stays in the car and it freezes- but she says the car stays in the garage.

any thoughts or help?
thanks
darcy
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Old 07-12-2018, 09:40 PM
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Lynam55 Lynam55 is offline
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Re: NC Miata battery issues

Yeah weird. What type of "charger" is she using? Maybe she doesn't have a auto trickle charger and she is over charging her battery and causing damage.

I recommend Battery Tender Jr for a auto charger. $40 at craps.

Automotive batters tend to last 4-6 years before needing replacement. Unless there discharged or damaged.

Having said that they can last over +10 years if properly taken care of.
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Old 07-13-2018, 09:29 AM
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Re: NC Miata battery issues

Quote:
Originally Posted by darcyw View Post
Hi Miata owners.
I have an acquaintance who has an '07 Miata owned since new, with less than 50K kms. She says after winter storage, she can't start the car. The dealer tells her to replace the battery. Battery replaced, the car starts. She is getting tired of this. I asked if she puts a battery tender on it and she said she has.

this does not make sense to me unless the battery stays in the car and it freezes- but she says the car stays in the garage.

any thoughts or help?
thanks
darcy
Is there any way to check if the tender is outputting the right voltage? Cheap ones may not regulate properly and just prolongs the discharge instead of keeping it up.

Also, does she have any issues in the summer?
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Old 07-13-2018, 09:49 AM
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Re: NC Miata battery issues

Disconnect battery when put into storage and hook up the battery tender.
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Old 07-13-2018, 11:38 PM
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darcyw darcyw is offline
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Re: NC Miata battery issues

thanks everyone. I still think she's being taken for a ride by the dealer, but I'll talk to her and check out her set up as well.

much appreciated. I was just wondering if this battery issue is a common Miata thing.

darcy
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Old 07-14-2018, 09:41 AM
mphysk mphysk is offline
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Re: NC Miata battery issues

I had a similar issue and after a bunch of m.net reading the nc does seem to eat batteries
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Old 07-14-2018, 10:36 AM
MartynD MartynD is offline
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Re: NC Miata battery issues

Doesn't make sense to me... I'd be looking at her 'charger' ...
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Old 07-14-2018, 10:54 AM
h-bomb h-bomb is offline
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Re: NC Miata battery issues

I use an old trickle charger from Canadian Tire that has a "float" mode and it's kept my batteries alive over the winter for over a decade.

Only once where I didn't properly plug in the cables and the battery froze did I have any issues.

If her charger is correctly specified to maintain a floating state, the batteries should not die like that.

If they did, then you should be able to claim the normal warranty on the battery. Most are free replacement within the first 2-3 years.
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Old 07-14-2018, 06:09 PM
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Re: NC Miata battery issues

Iíve stored my MX-5 during the winter since new (winter of 2010-2011) with only the battery disconnected and am still on the original battery. Last Spring I had to clean off some corrosion and am pretty sure Iíll have to replace the battery next Spring but its given me zero issues.
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Old 07-21-2018, 05:51 PM
buurin buurin is offline
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Re: NC Miata battery issues

My original (wet) battery lasted 9 years then I changed to a yellow top 9+ years ago. The yellow top has been run dry a few times and struggles to start in winter but it still does. I don't have a trickle charger but on occasion I do hook up my regular crappy tire charger that does 4-20A.

You know what car I have.
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