Trouble Fitting 12v Battery

I assume that your Prius does not have the Smart Entry/Smart Start feature, hence that is why it was equipped with the shorter 12V battery. You can replace the battery bracket with a bracket that will fit the longer battery used with SE/SS Prius, or else buy the shorter battery from your Toyota dealer.

Note that the replacement battery has an A-15 sticker on it. Usually that means the battery was built in January 2015. If that is a correct interpretation of that sticker, I would refuse that battery.

 

You can buy the longer battery bracket at your local Toyota dealer.

 

Looks like the Eliminator has different style posts too. I would just buy the correct battery those factory battery’s are very high quality and will out perform anything you can buy. My original battery lasted almost 7 years.
The less interaction Over the years with the 12 volt the better.

 

I have that battery in both of my Priuses. Its cheaper than the dealer battery and it has a 5 year warranty. Battery posts are correct and it has the vent hole in the right place.
In Canada I have only gotten about 3 to 4 years out of the dealer batteries so I don't see how I can do any worse with these.

I had the same fitment issue in the non keyless Prius we have. I would stick with the bigger battery because it has more reserve. I just cut the end off the battery bracket to fit the bigger battery in. The battery is still well secured and stable.