Not sure how much help is this, as I don't have any fog or side lights. However, my dealer told me that the stock bike would need to run about 20 min after starting in order to recharge the amount of battery used for the start. In theory, if one rides it for short distance and needs to start the bike a few times in a short interval, then there may be an issue with the battery not having enough juice. The more the gadgets, i.e. fog lights, perhaps the faster the battery is drained ?