51r Car Battery

Noticed very recently the battery for the Fit was feeling pretty weak – start ups were taking a bit longer than usual. The dash lights would flicker during start up. The windows would make noises like they were struggling. The effects were exacerbated the colder it was or the longer it sat, and twice to my disbelief the battery was dead and had to be jumped. Hopping online, I quickly found out the stock 151R battery was notoriously bad, and given that this car is a 2010, the battery had outlasted most stock batteries (unless my sister has previously changed it). Looking online, it became clear the solution was to go from a 151R to a 51R. Moderately larger in size, particularly length, but packs 500CCA compared to the stock 330. I looked through a few posts and decided this was a doable modification for me.

  1. Cheapest 51r Battery
  2. 51r Car Battery Interstate
  3. 51r Car Battery Reviews

1-16 of 429 results for '51r car battery' Megavolt Lead Acid Flooded Car Battery BCI 51R, 12V 55AH CCA500 CA525 (51R-60-500) 4.2 out of 5 stars 20. Built with a maintenance-free design, Duracell® Automotive Battery - Group Size 51R has been optimized for ultra-premium performance and all-weather starting protection. Combining state-of-the-art engineering with computer-controlled manufacturing techniques, along with more than 250 quality control checks, Duracell has ensured that the Duracell 51R car battery delivers.


Envelope Separator design, helps eliminate shorting and corrode-through to maximize reliability and battery life. Manufactured with dozens of quality control checks to provide ACDelco quality. Fits these vehicles. 4.8 out of 5 stars. Read reviews for ACDelco Advantage Battery 51RS Group Size 51R 460 CCA. Super Start Extreme Battery Group Size 51R. Part # 51REXT Line: SSB. Count on Super Start Batteries to start your car, truck or boat time and time again. Super Start offers proven technology, improved starting reliability, and extended service life to provide unmatched performance for today's vehicles. And, with a nationwide warranty.

  • 51R battery
  • 10mm wrench
  • Dremel (for cutting/grinding)
  • Basic tools

This DOES require cutting/trimming with a dremel, but this was the solution I found most reasonable. Please do at your own risk. If you feel uncomfortable, just take it to a professional.

Cheapest 51r Battery

Old battery at the top – new battery at the bottom. Went with a 51R from Advanced Auto because of a coupon I had. I believe any 51R is equivalent. The Autocraft Gold came with a 3yr warranty.

Old battery removed


Test fitting the new battery. It was a squeeze – but don’t be discouraged, it fits! And I think the 51R I got was a little longer than other 51Rs. Note, I took off the blue clamp that was holding the main power cord that leads to the red terminal in this picture. Fairly typical plastic clip, I just wedged in a screwdriver and knife on the sides to undo it.

There was also a 10mm bolt holding the other side of the terminal, as shown in the picture. Undid that bolt so I would have more room to move it around.

I cut the corners of the right side of the battery holder so I could still use it – I didn’t cut the right side off though, just the edges, so when I sat it down it would still be of use.

Most importantly, which I neglected to take a picture of – I dremeled down the right side of the airbox. The airbox had a lot of fins that needed to be dremeled down so the power cord could slot between the box and the battery, so it sits as it does shown in the picture. Also reinstalled the battery tie down.

Last thing I cut off with the dremel. Maybe my particular battery was a little tall, but there were plastic edges on the right side of the full power terminal that stuck down like two stalactites – they were preventing me from sitting the connector down as much as I wanted to. I struggled trying to get it on without doing this, including using aluminum foil to make the terminal a bigger surface to clamp down on. It still wasn’t good enough, so I did have to cut those down to get it where I wanted.

Overall, I’m extremely happy with this modification. The car starts up so much quicker, and I feel like the battery is going to be less taxed than a normal one would, given the Fit is designed to use the 151R. There is zero lag in the start up, and I’m sure the alternator isn’t working as hard to constantly recharge it. Time will tell if this battery lasts, but I have high hopes!

25 Aug 2016

Does your car need a new battery? It’s almost time to replace mine and we decided to check out the batteries at Costco. Instead of Kirkland battery, Costco now carries Interstate Car Battery.

51r Car Battery Interstate

Costco has various battery sizes:

51r Car Battery
  • 25-640 fitment#6
  • 35-640 fitment#3
  • 65-850 fitment#4
  • 34-800 fitment#9
  • 78-800 fitment#7
  • 51R-500 fitment#11

There may be other sizes available but these were the ones we spotted that day.

Prices range from $72.99 to $92.99.

There’s an additional $15 core fee on all battery sales. This fee is refunded when you return your old battery to Costco.


51r Car Battery Reviews

There’s a 42-month free replacement warranty on the batteries.