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Thread: Upgrade/Replace 51R group battery size to group 35 or 24F with hardware Reply to Thread
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Topic Review (Newest First)
02-03-2018 10:10 AM
51R vs 35 Group

Thanks for this info - Currently working this exact replacement issue !! Have a great day.
01-06-2018 05:14 AM
jb4674 I put a 34 as well in my 2014 EX and I didn't use any upgraded parts. I took the plastic box out, replaced the battery and used the same tie down.
01-05-2018 07:50 PM

How I put a Group 34 AGM in a 2014 Sport without needing any special V6 parts.
01-05-2018 05:09 PM
SlvrDragon50 Just threw in the 24F battery as an emergency until the actual OEM parts come in. Car starts up sooooooooooooooo much better.
01-05-2018 12:34 PM
rookie My car is just over a year old so no issues yet but... imagine my surprise when I realized (just now) that my 7th gen also came with 51R battery (and I have been driving it since 2005). And you know what - I never had a problem...

All of that being said - I appreciate knowing exactly what I need if I want to go up to a larger battery when time comes; which I think I will do (likely 35). Seems like the 9th gen has a lot more load on the battery when in Aux mode and sometimes I do that.
01-05-2018 08:29 AM
SlvrDragon50 2nd battery dead but out of warranty now A little under a year for this one.

Just bought all the OEM parts to put in the 24F battery (~$60 shipped). Will have to find a good 24F battery to drop in.
09-04-2017 06:41 PM
Originally Posted by greg1c View Post
It is true you can do this without new hardware, but it will look like a factory install if you have the hardware. The plastic covers are there to protect the battery in a collision and to protect the car from leaking acid and a battery explosion.

Sent from my Nexus 5X using Tapatalk
Can I delete the BSM (battery sensor) without having a constant light on in the dash? I didn't like the thing before, and even less since they started recalling them. My VIN still comes up empty for the recall on Honda owner's website. I tested the sensor, and it passed, and I haven't had any issues, yet. I'm probably going to replace the 51r with either a 35 or 24 when the time comes.
09-04-2017 05:32 PM
greg1c It is true you can do this without new hardware, but it will look like a factory install if you have the hardware. The plastic covers are there to protect the battery in a collision and to protect the car from leaking acid and a battery explosion.

Sent from my Nexus 5X using Tapatalk
09-02-2017 12:04 PM
Originally Posted by oOKhanhOo View Post
Don't waste you money on box and cover. You only need the plate and one of the bolt. You can reuse the other one that came with the car. I don't remember which one. Buy both don't take it out the bag, put it it where it's suppose to go and see if you have enough thread or next to the old bolt. Return the one that you don't need.
Just figured out that none of these parts are necessary if you want to do the cheapest conversion. Just got rid of the OEM 51R battery (which was previously replaced under warranty and conked out after 2 years). Remove and discard the existing battery box and place the 24F battery down. Use the longest bolt on the side that's closer to the front of the car and insert into one of the holes available on the metal plate. Bend the tab on existing hold down plate and attach the bolt to the hold down plate. There are just enough threads for the bolt nut to thread through (1-2 threads stick out through the top of the bolt). Use the smaller bolt on the other side and voila ... your only cost is the price of the 24F battery! The battery I got is the DieHard Gold 50923 (rated high on CR as of 9/2/17)
05-29-2017 08:15 AM
Originally Posted by Dimon aggie View Post
Question: When replacing an original 51F with a 24F, is a larger-gauge ground cable required?
No. You aren't changing the amount of power the car draws...Just giving it...a deeper well to draw from
05-29-2017 07:47 AM
Dimon aggie Question: When replacing an original 51F with a 24F, is a larger-gauge ground cable required?
04-25-2017 10:25 AM
Originally Posted by chasemyaccord View Post
I just popped in an Interstate 24F from Costco ($83.99, such a steal) and everything seems great. 42 month warranty period is awesome too.
Was wondering what the Costco price was and have been too lazy to drive over and check it out. That's even cheaper than the Walmart Everstart-Maxx. Pretty sure my 2013 V6 has the original battery (bought the car last December) and it's over 4 years old based on the vehicle build date. Will most likely spring for a new one before my summer trip.
04-25-2017 01:00 AM
Pushinair247 Just swapped my original 51R with a 24F. I bought the battery box (tray) for the V6, but decided to save the money and not buy the plastic battery cover. Was able to use the original hold-down bar and bolts/nuts.
04-12-2017 02:58 PM
Originally Posted by desertrat View Post
I don't know for sure, some people on here really seem to like sealed batteries. I have had better luck with the kind you can add water to. I usually check mine once every oil change and add distilled water when needed.
So true. I am on my 3rd. sealed battery, they last 3 to almost 4 yrs.(84 month warr.). A battery you can add distilled water to will last much longer but most people see the "maintenance free" & think you never have to check the water level in the cells.
04-12-2017 02:20 PM
rawdatalab I went with the Walmart "Canadian" 24F (725 CCA) and splurged on the V6 plate to hold it down. The flattened i4 plate was doing the job, but I didn't like the way it was digging into the battery casing. Couldn't justify $60+ for the tray/cover, though.

Now I'm ready for NYC winters.
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