I have a cranked up the bike today and gone for a ride, within 3 miles the engine started to lose power and then it just died. I tried to start it but nothing and then the battery was dead after about 10 attempts to start. I know that the battery is a bit weak but I keep it on a Halfords trickle charger when not using the bike. I only ride at weekends. If the problem is due to a weak battery why would the bike just lose power mid ride in 4th at 60mph?