Yuasa SmartShot.
In fact, I'm still using Yuasa SmartShot 900s (Model 12V900), the oldest of which I bought back in 2002. Got them on my toys any time they're unused for more than a couple of weeks. Out here, desert life is hard on batteries (I'm in Las Vegas), with temps that dwell well below 32F (0C) and then, a few months later, over 110F (43C). Kills batteries if you leave them to their own devices.
As a retired electrician, I can tell you that I'm picky about my stuff, and these things are tops. Research them. Well worth your time.
Best to ya!
'rider.