Does it invalidate the guarantee if the battery is opened & what do you see inside ?
On my latest test with a new battery it only lasted 8 mls again The round trip was up hill on full power then free wheeling down whit hardly any power used on the flat
I am 15 stone and my old Agattu easily coped with the same trip with the battery still showing 2 lights, but the Powabyke is lighter , a much nicer ride and the engine push more powerful ,and the cycling gears easier.
I think I will have to compromise and carry the spare battery, but this pushes the price paid for the outfit to £1114