take off the seat and under the seat just behind the end of the tank is the battery, jump start and leave running or take for a good run, invest in an optimate trickle charger, this can be on the bike all the time if you have standing for long periods it has a fixed lead so it has a permenent plug in point for the charger, check the battery to see if it a sealed or refillable, which means sealed when *****d sling it,refillable, top up with sterilized water or buy some from one of the main car accessory shops.top up to the level marks and charge it may be ok.