The 51R battery was undersized for all Honda applications just as a cost cutting and weight reduction decision by the designers. You should do the simple upgrade to the 24F battery as shown in this video:We have a ‘17 accord with the 2.4l 4cyl. The battery is now 5.5 years old and is starting to show its age. I was going to buy another OE Honda battery, but was wondering if any of you could recommend something other than OE? The car takes a 51R battery. Who makes the Honda branded battery?
51R to 24F Upgrade for '17 Accord
The basic upgrade takes 5 minutes to flatten the metal tab on the hold down bracket. You can also go full tilt and replace the plastic battery tray and hold down bracket with the OEM Honda pieces from the V6 Accord for a factory appearance. As noted in the video, your engine will crank quicker with the more stout 24F battery, especially during the frigid Wisconsin winters.