Ok, long story short, I left my park light on at work (whoops, not used to that extra turn on the key!!). Came back and the bike was flat. Bump started and got it home. Been doing some reading and it seems that leaving the bike to recharge with normal running is not a good idea, as the alternator is really only meant to keep the battery at a constant level. With the low voltage, apparently it can burn out? So, my house mate has a battery charger that pumps out 12.5V @ 2.5A. Read the bike manual and it states: 'The standard charging rate is 1.2A for 5 to 10 hours and maximum rate is 5.0A for one hour. Never exceed maximum charge.' You think it would be ok for me to hook it up for maybe 2.5 hours??