Choosing the correct battery charger to suit your RV, Caravan batteries is critical to ensure the best life out of your deep cycle batteries. By using this battery charger calculator tool below, this should give you an idea of what size charger is best suited for your application. Also when choosing a battery charger, please ensure it's designed to suit your type of batteries. I.e. AGM, Gel, Calcium SMF etc... This tool is designed for all conventional lead-acid type (AGM, Gel, Calcium SMF) batteries only. For Lithium LifePO4 (LFP) Batteries, check with the battery manufacturer for their specific charging requirements.