It's been below zero here for over a week and I don't drive the GXP as much in the winter I need to keep the battery charged. My 50 amp starter/charger decided to fail me and since it was over 20 years old I went to Harbor freight to get a new one. While I was there I saw these inexpensive wall wart type chargers hanging there. They are a 12 volt wall plug with some type of charging circuit and alligator clips for batteries. Since I have all the parts at home and being cheap I decided to make one myself, with out the special circuit. Myself and a voltmeter will replace that. It works fine. No more slow starts at -5 degrees. My battery was down to 12.0 volts, plugged this in for a half hour and back to 12.6 volts. Been doing this off an on all week to fight the cold battery voltage loss. The proper ones are on sale with a coupon for $4.99 but this one was free and it works. Just need to keep an eye on the voltage. My junk box wall wart puts out 14.5 volts of DC @ 350ma. The old charger gave up the clips. I used the $5 for lunch instead.
