Yes it is. It's a Group 31 battery. One of the cheapest I could find. They use it a lot, locally, for the boats. The Optimas were so expensive, I did not want to get one. There were no XS available at the time I was ready to buy a battery. Now I can find a few, but they are so expensive, it's not an option for me. So far, I have no problem with this one. ;-) ;-) I just questioned it because it looked like it had plugs you could pull out to check the acid level. I checked again ! No vents I can take off to check any level ! They are dry cell batteries...I don't know much about them. Vision EV31 is the name. Chinese batts. They have a website but I don't know how to really compare batteries.