Last feb I decided to replace my battery after the bike seemed reluctant to start during cold weather. ST is kept outside, but temps aren't too bad in Seattle and the the bike was used mostly for a fairly short daily commute and was otherwise very healthy. For some reason (?) I bought an X2Power CYL10030 Lithium battery from Batteries Plus nearby. Amazingly light in weight I marveled that it could do the trick. Seemed ok. Maybe cranked a little slow when really cold but always started, except once when I left the ignition and headlights on while I ate breakfast one day, at which point it was stone cold dead. Bit of a charge and I was back on the road. A few months later, early this fall, I noted that on cold mornings the bike was cranking slow before starting and that my clock and odometer would reset! Battery showed a full charge. I replaced it with a Motobatt, which I have used for years in my Guzzis and has never showed any sign of weakness whatsoever even after the bakes have been parked for months on end. Pretty sure that headlights on for an hour would not phase it.