Optimate DC to DC 12 V Battery Charger with Batteries

Been struggling for a while to solve the problem of motorbike battery maintenance when stored away from any mains electric source.This product, in conjunction with a deep cycle 12 v supply battery, seems to provide the answer....Charging at 2 amps and then maintaining at a low trickle level over the long term, it avoids the scenario of a flat battery in a little used bike.Honda recommend Optima chargers.....so they must be good....!!