I bought one of those electric cooler converters for using the 12 volt cooler inside the house. I cut the female cig lighter and put on eyelets so my alligator clips on my charger clip on to it. It says 5 amps output but I never charge over 3 amps. Use it on a Triton Jr. Paid about $15. Be careful with the lead acid battery's. They do not like to be brought down to far and even one time discharging it will take away most of it's life.