Why not try a trickel charge over night during the cold spell. When using vehicles underground the same thing happens plus there running a beacon full time as well. A trickel charge when resting saves replacing batteries every few weeks.You may want to check if you have to disconnect the pos or neg terminal before charging.
I bought a beaut little charger from battery world for around $40 it keeps the KTM on maintenance charge for weeks at a time. Must sell that bike never seem to ride it anymore.
Mike

