I was an early user of the XP-3 in mid-late 2013. Saw it at a car trade show in Alb., NM and thought it fit perfectly for the bike on the road duties.
Fortunately for me, it's never started my bikes, but has started others and cars. I'm still using that same XP-3 and generally try to remember to charge it at least twice a year. Never fail me yet.
That said, the Juno Jumper might be the ticket for the bike. Thanks Eric.