# Yikes, did I mess up with my battery purchase (commercial vs. deep cycle)
**URL:** https://community.electricforum.com/t/yikes-did-i-mess-up-with-my-battery-purchase-commercial-vs-deep-cycle/15556
**Category:** GEM Forum
**Created:** [March 4, 2019, 3:09pm UTC](https://community.electricforum.com/t/yikes-did-i-mess-up-with-my-battery-purchase-commercial-vs-deep-cycle/15556 "2019-03-04T15:09:27Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@IRBGEM](https://community.electricforum.com/u/IRBGEM)
#### Post date: [March 4, 2019, 3:09pm UTC](https://community.electricforum.com/t/yikes-did-i-mess-up-with-my-battery-purchase-commercial-vs-deep-cycle/15556/1 "2019-03-04T15:09:27Z")
Got a used E825 with two year old dead (NAPA) batteries. Called the local store and got a small discount because of the age, so I went ahead and pulled the trigger. When I got there I noticed that they were “Commercial” group 31 and not deep cycle. After seeing this I called the local Gem dealer and was told that commercial batteries will be fine in this application.
Batteries in question:
[[https://www.napaonline.com/en/p/NBP7236](https://www.napaonline.com/en/p/NBP7236)]
My question is this: Did I just mess up and buy the incorrect batteries?
Thank you for the input.
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### Author:  [@JarJarJava](https://community.electricforum.com/u/JarJarJava)
#### Post date: [March 4, 2019, 4:10pm UTC](https://community.electricforum.com/t/yikes-did-i-mess-up-with-my-battery-purchase-commercial-vs-deep-cycle/15556/2 "2019-03-04T16:10:48Z")
Don’t know the answer to your question, but I was curious if you remember which NAPA batteries that only made it 2 years were in there before?
I’m looking at replacing the old Trojan T1275’s in an e825 and was considering the NAPA GC12
[https://www.napaonline.com/en/p/NBP8141](https://www.napaonline.com/en/p/NBP8141)
Would rather not make a $1200 mistake if they aren’t going to last.
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### Author:  [@IRBGEM](https://community.electricforum.com/u/IRBGEM)
#### Post date: [March 4, 2019, 4:23pm UTC](https://community.electricforum.com/t/yikes-did-i-mess-up-with-my-battery-purchase-commercial-vs-deep-cycle/15556/3 "2019-03-04T16:23:40Z")
Jrvara-
I wouldn’t worry about the brand/model in this case. The issue wasn’t with the batteries themselves, it was with the previous owners treatment of the batteries. The car came out of a municipal fleet and they let the batteries sit, unattended, for a year or more. The constant state of discharge killed them.
I looked at the batteries you are considering and think that they might be a bit too tall for this application- not sure that the battery hold down system will work with them. I believe you want to be looking at Group 31 size instead of GC12. Maybe a more experienced member will weigh in on this.
Regards,
Paul
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### Author:  [@JarJarJava](https://community.electricforum.com/u/JarJarJava)
#### Post date: [March 4, 2019, 4:47pm UTC](https://community.electricforum.com/t/yikes-did-i-mess-up-with-my-battery-purchase-commercial-vs-deep-cycle/15556/4 "2019-03-04T16:47:07Z")
Thanks Paul. That makes sense. Pretty much the same story as the e825 that I just picked up.
Interesting point on the height, I did notice the 1/4" difference, but didn’t think it would interfere. I’ll have to double check.
I was under the impression, possibly due to being given incorrect information, that the GC12 was the Deka counterpart (re-branded for NAPA) to the Trojan T1275 - maybe someone with more experience can comment. If I could find the Trojan’s around here, I’d get them since the price is the same. It would certainly be simpler.
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### Author:  [@IRBGEM](https://community.electricforum.com/u/IRBGEM)
#### Post date: [March 4, 2019, 5:38pm UTC](https://community.electricforum.com/t/yikes-did-i-mess-up-with-my-battery-purchase-commercial-vs-deep-cycle/15556/5 "2019-03-04T17:38:30Z")
> [@JarJarJava](#):
>
> Interesting point on the height, I did notice the 1/4" difference, but didn’t think it would interfere. I’ll have to double check.
Regarding the height, you’re right. I was comparing those to the batteries I purchased (which is looking to be incorrect for the car/application). I did’t have a frame of reference for the correct battery.