Battery upgrade: big size 24F with lots of pictures - Drive Accord Honda Forums | radio-pro.ru
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post #1 of 28 Old 01-02-2015, 07:35 PM Thread Starter
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Battery upgrade: big size 24F with lots of pictures

I apologize in advance for this really long posting, but this might be timely given cold weather has set in. The battery in my son’s ’05 I-4 Accord died recently and I took the opportunity to skip right over the V6 battery upgrade and go all out with a group size 24F battery. Thanks to xJoeMama78 and others for the tip. I’ve posted pictures to show that a 24F really does easily fit, in case others want to do this too. Ironically the 24F is the same size that’s in my Acura TL.

The 24F battery was $2 more than the V6 size 35 at my local Sam’s Club. My main goal for upgrading the battery is not so much cold start performance, but I need a battery that holds up better than stock when the car is parked outside and not used for extended periods. I also replaced the sad looking ground wire while I was in there messing with it, and had to use a generic battery tie down. I found out the OEM j-bolts are different sizes (one long and one short, didn’t see that one coming), and only the long one fit the new battery tie down. So I also had to buy a new pair of j-bolts. I spent about $15 at my local Advanced Auto Parts for the ground wire, j-bolts and tie down.

For reference, here are the cold cranking amps (CCA) listed for these batteries at Sam’s Club. I’ve noticed the CCAs can vary a bit for a given size, depending on the brand (if you believe they really are different and not just marketing hype).

Group 24F, 725CCA – this is what I installed.
Group 35, 625CCA – V6 OEM size.
Group 51R, 500CCA – original

Here’s a picture with the OEM battery, tie down and j-bolts removed. You can see there’s a plastic battery tray that just pulls out. There’s a metal shelf underneath. The reason they use a plastic tray is to contain any potential acid leaks before it reaches the metal parts. I can’t remember the last car I owned that actually leaked acid from the battery, so these days I think it’s more cosmetic than anything.

Removing the tray reveals a metal shelf, and tons of room:

This shows the sad looking OEM ground cable (8 gauge ) vs. the 4 gauge new one. It only needs to be about 4” long, but the shortest I could find was 10”.

Here’s how I installed the new ground cable. I did not grind the paint off the frame around the ground bolt. That’s really not needed, there’s already a nut welded to the frame for the ground bolt with plenty of contact surface area. I did sand the underside of the captive washer on the ground bolt, and also used a second washer with the new ground cable (since the bolt hole is larger in the cable).

Here’s the OEM j-bolts and the generic tie-down, and a picture of the new j-bolts. For the tie-down I bought, the 8” j-bolts fit perfectly. If I had to do this over again, I would have spent more time looking for a better tie-down. This one does the job, but the 24F is a big boy (40lbs vs. 28lbs for the OEM 51R), and a more beefy tie-down might be better.


Here’s the new 24F installed. The red stuff that looks like paint is anti-corrosion spray.


So there you have it. It’s a very easy upgrade and should perform much better than stock (or the V6 battery size). I hope this helps others wondering about battery upgrades. This is a fantastic forum for Accord owners.

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post #2 of 28 Old 01-02-2015, 08:17 PM
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Question, I have the standard size battery (only about a year old, didn't know about the upgrade when buying the replacement) but, can I get the upgraded ground cable and install it with the stock 4cyl battery class? I know it won't do anything right now, but I will be ready for a bigger battery when this one dies...


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post #3 of 28 Old 01-02-2015, 09:19 PM Thread Starter
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Hello Carlson, yes you can change the ground cable anytime, a bigger cable never hurts. I just upgraded it because I had the old battery out and the original cable just looks wrong, and a better cable was cheap to buy. Technically I didn't need to change it due to the battery upgrade - I didn't change anything else in the electrical system so the current draw from the battery is the same as before. However, the new battery is much more capable in adverse conditions vs. the OEM size, and that is what I was going for. Honestly, changing the ground cable is not an improvement you can easily measure and probably won't do anything for 95% of Accord owners with stock electrical systems. But if your cable looks corroded, or you plan on upgrading the electronics (stereo, etc.) a bigger cable is a good thing.
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post #4 of 28 Old 01-02-2015, 09:31 PM
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Great write up! Definitely something I'll have to look Into in the near future. My accord's battery died after sitting in the garage for 4 days. Battery is barely 2 years old. Just goes to show just how weak the 4 cyl batteries are.
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post #5 of 28 Old 01-02-2015, 10:22 PM
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Great thread! On these cold winter mornings I wish I would have upgraded my battery to a 24F! So far my 51R is working fine for now.
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post #6 of 28 Old 01-02-2015, 11:40 PM
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Great write up! Definitely something I'll have to look Into in the near future. My accord's battery died after sitting in the garage for 4 days. Battery is barely 2 years old. Just goes to show just how weak the 4 cyl batteries are.
got a 3 yr replacement warranty on that beotch? if so, after it dies this weekend from accidently leaving all your lights on for 24 hours and again next weekend (after you jump it off and drive it all week) , take that mofo back and and have them exchange it for the v6 battery with you paying the difference.

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post #7 of 28 Old 01-03-2015, 01:10 AM
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There's not much benefit to upgrading the OEM ground strap unless it's corroded. The main benefit would come if you added more grounding points connected to the battery.

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post #8 of 28 Old 01-03-2015, 04:44 AM
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Well done. That is some nice battery porn. I didn't know Duracell makes car batteries too.

If you happen across this individual out on the road, feel free to run him over...

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post #9 of 28 Old 01-03-2015, 10:12 AM
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Quote:
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There's not much benefit to upgrading the OEM ground strap unless it's corroded. The main benefit would come if you added more grounding points connected to the battery.
While this is true, I have noticed green copper oxide on the surface of the crimped area in many cables, I usually spray a couple of shots of anti-rust oil spray in those areas to keep it from oxidizing.

A new ground strap cable, especially a heavier gauge one, certainly cannot hurt, since the ground strap has to carry all the current to complete the circuit when an electrical load is place on the system.
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post #10 of 28 Old 01-03-2015, 10:41 AM
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If your car has a parasitic drain, wouldn't it kill any battery? It might take longer, but would still kill it eventually.

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post #11 of 28 Old 01-04-2015, 12:31 AM
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Is this safe to do? will this cause undercharging of the battery?
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post #12 of 28 Old 01-04-2015, 06:46 AM
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Saw this yesterday morning and thought. That is timing!
Plans for the day to buy new battery for the I4 09 Coupe.
Decided just to use the standard size as we don't have cold weather and it is driven daily.
Though it was intriguing!

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post #13 of 28 Old 01-04-2015, 06:47 AM
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Should have read up on the consumer report. The Interstate MTP Plus II has 800 CCA and is what I replaced the OEM one with.
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post #14 of 28 Old 01-05-2015, 02:46 AM
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Well done. That is some nice battery porn. I didn't know Duracell makes car batteries too.

If you happen across this individual out on the road, feel free to run him over...


lol, nice Battery upgrade thread!...i'll try and get pics of mine ASAP too. Not sure what my Battery size is off the top of my head but mines around your size and one of my 1st mods

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post #15 of 28 Old 01-05-2015, 06:07 AM
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Great job! I did mine last winter after a few issues with the stock sized battery. Very happy I did and recommend the mod to anyone that deals with temp. extremes. One quick note, if you are worried that tie down will not hold you can use the original from your car... there is a little metal tab that is folded down, if you flatten that tab the tie down strap will fit over your larger battery.

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