Just bought myself a Viking (from HF) lithium jump starter for the car. It's relatively compact but not nearly small enough to carry it in a bike bag. Since the demands of a bike battery is so much less, I was wondering if there are any smaller jumpers that are still good enough for jump starting the VTX. Got burned by a dead battery after stopping for gas a while back. Thank God I was close to home otherwise I'd be a missing person.