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#4686373 - 03/06/18 02:22 PM 2010 Accord New Battery
Phishin Offline


Registered: 05/01/12
Posts: 2425
Loc: Indiana
The original OEM Panasonic was replaced 4 years ago with another OEM battery by Honda (covered under warranty).

This second battery has been getting sluggish lately. I put it on a charger this week, but this morning, she wouldn't start. So I took out the anemic OEM 51R battery (400 CCA's) on my lunch break
and purchased a bigger (24F) East Penn/Deka battery (Napa Legend Premium....725 CCA's). I only buy East Penn batteries. This thing comes with a 7 year warranty.

I'll install it later tonight when I get home from work.



Edited by Phishin (03/06/18 02:29 PM)
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#4686379 - 03/06/18 02:29 PM Re: 2010 Accord New Battery [Re: Phishin]
Tdbo Offline


Registered: 08/18/09
Posts: 3224
Loc: Ohio
That's the course of action to take.
My Accord came with a 51. After 1 winter, I went with a 35. No problem since.
I will probably put a 24 in when the AAP Gold I put in it goes south.
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#4686380 - 03/06/18 02:32 PM Re: 2010 Accord New Battery [Re: Phishin]
Bottom_Feeder Offline


Registered: 12/07/08
Posts: 3004
Loc: Occupied Virginia
I've been looking at battery size upgrades on my 2015 Accord with the 51R. I've heard lots of people doing the swap, but does the stock alternator have enough output to charge a larger battery reliably?

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#4686412 - 03/06/18 02:58 PM Re: 2010 Accord New Battery [Re: Phishin]
Char Baby Offline


Registered: 05/25/05
Posts: 10013
Loc: ROCHESTER, NY
I always try to stuff a 24F battery into my Asian cars that come with a group 35 or 51R.
Good choice!
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#4686422 - 03/06/18 03:07 PM Re: 2010 Accord New Battery [Re: Bottom_Feeder]
Tdbo Offline


Registered: 08/18/09
Posts: 3224
Loc: Ohio
Originally Posted By: Bottom_Feeder
I've been looking at battery size upgrades on my 2015 Accord with the 51R. I've heard lots of people doing the swap, but does the stock alternator have enough output to charge a larger battery reliably?


I went with a 35 because later in the '12 model run, they switched to them in the 4 cyl. Accord.
A 51 in that application is woefully inadequate.
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#4686432 - 03/06/18 03:20 PM Re: 2010 Accord New Battery [Re: Phishin]
Richie Offline


Registered: 06/10/04
Posts: 284
Loc: Valencia, CA
I wish the larger battery would fit in my 2015 Civic. I hate dealing with the inadequate 51R

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#4686473 - 03/06/18 04:04 PM Re: 2010 Accord New Battery [Re: Bottom_Feeder]
Wolf359 Offline


Registered: 04/27/12
Posts: 4739
Loc: MA
Originally Posted By: Bottom_Feeder
I've been looking at battery size upgrades on my 2015 Accord with the 51R. I've heard lots of people doing the swap, but does the stock alternator have enough output to charge a larger battery reliably?


The size of the battery should have no effect on the alternator. The output stays the same, it just takes longer to fully charge it if it's dead. Otherwise if the load is the same, it wouldn't even notice. The larger battery just means you have a longer reserve time and maybe the larger battery is better made or because it has more of a reserve, doesn't get drained as much and hence last longer because the more you drain a battery, the shorter the life.

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#4686521 - 03/06/18 04:59 PM Re: 2010 Accord New Battery [Re: Wolf359]
EdwardC Offline


Registered: 11/14/13
Posts: 1862
Loc: Chicago, IL
Nice work, Phishin! I did the same 24F upgrade in my 51R equipped Element. 4th year on that battery, doing great.


Originally Posted By: Wolf359
Originally Posted By: Bottom_Feeder
I've been looking at battery size upgrades on my 2015 Accord with the 51R. I've heard lots of people doing the swap, but does the stock alternator have enough output to charge a larger battery reliably?


The size of the battery should have no effect on the alternator. The output stays the same, it just takes longer to fully charge it if it's dead. Otherwise if the load is the same, it wouldn't even notice. The larger battery just means you have a longer reserve time and maybe the larger battery is better made or because it has more of a reserve, doesn't get drained as much and hence last longer because the more you drain a battery, the shorter the life.


Yep, very few downsides to a larger battery. Weight is one. I guess technically, if you happened to totally drain your battery, the alternator will have to work harder to fully recharge a larger battery compared to a smaller one, but that's not generally good for the alternator even with the smaller OEM sized battery - you should top it off with a separate charger.

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#4686587 - 03/06/18 06:07 PM Re: 2010 Accord New Battery [Re: Phishin]
Donald Offline


Registered: 03/21/04
Posts: 20446
Loc: Upstate NY
More CCA in same footprint is not always good. Typically more CCA in same footprint means weaker plates.
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#4686656 - 03/06/18 06:54 PM Re: 2010 Accord New Battery [Re: Phishin]
ford46guy Offline


Registered: 06/01/13
Posts: 525
Loc: Albany, NY
Originally Posted By: Phishin
The original OEM Panasonic was replaced 4 years ago with another OEM battery by Honda (covered under warranty).

This second battery has been getting sluggish lately. I put it on a charger this week, but this morning, she wouldn't start. So I took out the anemic OEM 51R battery (400 CCA's) on my lunch break
and purchased a bigger (24F) East Penn/Deka battery (Napa Legend Premium....725 CCA's). I only buy East Penn batteries. This thing comes with a 7 year warranty.

I'll install it later tonight when I get home from work.



The Walmart Everstarts are exactly the same. No more Johnson Controls.
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#4686661 - 03/06/18 06:57 PM Re: 2010 Accord New Battery [Re: Phishin]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1654
Loc: Crawfordville FL
Is there a list somewhere of who sells what batteries? I was told that O’Rileys is East Penn, NAPA is east Penn, but Walmart and optima and Bosch were all Johnson Controls


Edited by SilverFusion2010 (03/06/18 06:58 PM)
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#4686686 - 03/06/18 07:13 PM Re: 2010 Accord New Battery [Re: Donald]
bbhero Online   content


Registered: 03/20/15
Posts: 4610
Loc: Virginia
Not always true Donald...

Especially in this circumstance. Where a quite small group 51r battery was once located. A much larger group 24f in the same place makes this a different situation all together. It is not like a group 51r and 24f are all that close in size and weight. Much more weight and size with that group 24f.

In my car I can get a group 24f in my battery space. But the East Penn group 24f weighs 42 plus pounds. The group 35 weighs 35.5 pounds. A 51r I bet weighs less than 33 pounds or less.


Edited by bbhero (03/06/18 07:17 PM)
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#4686798 - 03/06/18 08:31 PM Re: 2010 Accord New Battery [Re: Phishin]
Roob Offline


Registered: 02/19/13
Posts: 446
Loc: Ontario,Canada
I looked at possibly doing this for my 07 Accord., went with the stock 51r a few years ago.
The cars been to the Sioux, North bay (to name a few) sitting for a few days in extreme cold, -30-40c..
Starting has been slower but the car starts reliably every time.
I figure if it can start reliably in those conditions, a larger, heavier and more expensive battery for me, is not needed.
Others needs may vary though.
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#4686816 - 03/06/18 08:41 PM Re: 2010 Accord New Battery [Re: Phishin]
gathermewool Offline


Registered: 01/09/09
Posts: 5986
I know East Penn batteries review well (both on here and places like Consumer Reports), but I don't like the idea of not being able to inspect the electrolyte level. I purchased one of these when I sold my Civic to a family member, but that's because he likely won't ever check the level, anyway.

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#4686830 - 03/06/18 08:49 PM Re: 2010 Accord New Battery [Re: gathermewool]
Chewie Offline


Registered: 10/08/15
Posts: 228
Loc: OH
Originally Posted By: gathermewool
I know East Penn batteries review well (both on here and places like Consumer Reports), but I don't like the idea of not being able to inspect the electrolyte level.


Don't have any personal experience with the battery in the photo, but it looks like that top panel with the "NAPA Legend" sticker is removal to allow people to check the electrolyte level.
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