+1 What Jeff said. I'm really partial to Odyssey products because of the good luck I've had with them in my TW's and in my dunebuggy. Honestly though the Odyssey is fairly expensive (but it comes with a cool decal!) so if someone didn't want to spend the extra coin just going with a cheaper AGM battery would be better than going with an OEM-style wet battery (IMHO). Unless you never plan on venturing off-road or falling over. But when you're laying on your side on a trail feeling your house keys digging into your left thigh, wondering how you're going to get your left foot out from under your now horizontal MC, you look-up to see your friend snapping pictures, knowing they're destined for the Internet before the sun goes down, it's nice to not have to worry about your wet battery dripping all over you or your TW.
The Odyssey batteries are made to last a decade, and they can sit on a shelf or in your bike for a year without loosing a charge.they are vibration proof. they wont leak acid and drip on your exhaust and frame. And if you keep and ride your Tw for 10 years you will spend more than $100 on cheap leaky batteries over that lifespan.Sheesh! I just went to the local battery refurbisher place & got one for just under $38.
I figure I'll either keep the battery going by riding the bike a lot more, or kill the battery again by letting the bike sit. Depends on what happens in the rest of my life.
For less than $40 I can get another one next year... I'm not paying $100 or more for a battery I might trash!
The lithium iron batteries in my models need a different charger from the lead acid battery that runs the starter system. I'd be very careful about simply replacing a lead acid with a lithium ion without the proper electronic adaptation to charge properly.