Yes, but I haven't as yet in the Buells, seems to do fine in the Suzuki ( 1340cc's ) The new lithium batteries have an electrical circuit built into them to make it safe to use trickle chargers so make sure the one you decide to get has it and you won't need any special charger, just a battery tender will work. Understand they're a bit slow to liven up in the cold, you have to turn on the headlight for a couple of minutes before trying to start the bike.
I haven't used the Suzuki since the beginning of last season and I haven't charged it at all, it started right up yesterday.