MinnKota Portable Charger With a digital design and your choice of power levels, our Portable chargers let you bring the action right to your boat. And they feature Automatic Temperature Compensation and fully automatic multi-stage charging to give your batteries the right charge every time you hook up. Automatic Temperature Compensation: Precision chargers sense and adjust to ambient temperature fluctuations to ensure a fast, accurate charge Digital Control: Microprocessor-based design delivers a faster, more precise charge every time LED Indicator Lights: Inform of charge stage, maintenance mode status, error notifications and full charge Automatic Multi-Stage Charging: Controls the voltage and current your battery gets throughout the charging cycle, ensuring a fast, safe and precise charge