I've been adapting one of those 2million candlepower handheld torches to have a remote battery..
If I ever finish it I reckon it'll be mountable on the stem.. cable to a battery pack which could be velcro'd under the seat..
Couple of spares in a backpack (they are the small-ish lead acid units - not excessively heavy) and I reckon it'd be hard to beat (current cost is about a tenner, plus 2 spare batteries at about a fiver each)..
If I ever finish it I reckon it'll be mountable on the stem.. cable to a battery pack which could be velcro'd under the seat..
Couple of spares in a backpack (they are the small-ish lead acid units - not excessively heavy) and I reckon it'd be hard to beat (current cost is about a tenner, plus 2 spare batteries at about a fiver each)..