Took the plunge and bought a lithium battery pack from the Midland last Saturday, as my old Deben battey pack was failing to hold a charge. After two outing this week, I can find nothing but praise for it! A 14a/hr pack that fits in your coat pocket, and runs for 3 hrs without going downhill, is far better than its predecessor ever was! £160 is not cheap, but hope it'll last for a few years. Only mod it needed was to ditch the fag lighter socket, and replace with the electric lawn-mower type.