Mighty Max BatteryYTX20L-BS - 12 Volt 18 AH, 270 CCA, Rechargeable Maintenance Free SLA AGM Motorcycle Battery

I use these batteries for starting in a stand-by generator (they have good CCA for their size). They work great and hold charge well for a long time. They can be mounted upside down, on their side etc and they are completely sealed (thus no gassing). They are absorbed glass mat (AGM) sealed lead acid (SLA) batteries. They are NOT gel batteries. They might slosh around a little tiny bit because of they contain just enough of the electrolyte to keep the glass mat wet but meh, that's fine, mine don't slosh at all except in extreme temperatures. True Gel batteries tend to be a bit prema-donna sometimes so I've found over time, these batteries do just fine and will work with any god awful charger.Pro-tip: I replaced my Mighty Max battery in my generator after 5 years when I thought it was dead because the battery tender wouldn't charge it anymore. Come to find out, it wasn't the battery, it was the tender. The original battery is still just fine after 5 years! Always check the tender before relying on it to make a decision on a battery. I should have known better and got lazy. That said, I just put the new one in the generator and kept the 5 year old one around to use for different projects until it finally gives up the ghost. If I get 5 years out of each of these on average I'll be doing just fine!

Hard to beat what you get for the money.My main issue is the bolts you are supposed to screw into are hard to keep in place. Unlike the ones on my more expensive battery that were held in place for you. These are more "fun" to try to keep where they should be. After a few drops down through the bike, I was finally able to get it locked in.Battery has handled both freezing temps and 100 degree plus days so far, so no complaints there.Has good cranking power and fires up the Valk without issue, even when the six carbs are being a little stubborn getting started after a few weeks sitting.Trusted it on a 3500 mile cross country trip and wouldn't hesitate to do it again.

Battery came fully charged at 13.1V and works very well. Holds a charge, and I have even let it drain down due to voltage draw issues on my bike. The battery charges right back up to 13 volts and maintains its charge even after the multiple drains I have done since purchase.

I bought this battery on November 7th, 2023, for my 2005 Polaris Ranger 700 XP 4x4. I don't drive the vehicle every day, or even every week, but every time I turn the key it starts right up. The only reason I didn't give 5 stars is because the last big snowstorm we had (January, 2025) the battery was too low to actually start the engine. It still was able to run lights, etc., and after a quick jump it started with no issue. I have had no issues before, or since. In fairness to the battery, the temperature was single-digit fahrenheit and the vehicle had been sitting for over a month.A decent battery for the price I paid. Cannot complain.

Battery arrived in very good shape and one day early. Initial voltage check was 13.1v right out of the box. I installed in a Predator 8750 generator. It cranked over with authority. It fit very well in the generator. I hooked up a trickle charger and it went from charging to maintaining in less than a minute.I am pleased as punch!

Pretty good battery, hooked it up to my ‘79 Honda Rebel and it has withstood cold weather, rain, and snow. It’s pretty light, maybe about little less than a gallon of milk. Easy to install, and it generally works great.

I Made it work..I could not find an exact battery for a gas powered Generator, but spec wise this one would,, The polarity was backwards from the stock battery.. No problem, I made my own longer cables and it works great..Great Battery! Charged up in under an hour. Well made.I will buy another when time comes.

Battery was a perfect fit and has been working great for a while now.