Review on NOCO GENIUS2D Direct Mount Temperature Compensation by David Weis

I use this to store my RV's battery, not to keep the trailer electrical system powered. Very well made, easy to install and use. Small. However, my RV battery is not fully charging. I've tried it twice, once in a store and a second time in the field. No matter how long I leave it plugged in, it never charges above 12.4 volts. Both times, frustrated, I connected my RV's electrical system to AC and SO the battery charged correctly to 13.4 volts. So for me it's pretty much useless and I lost 40 bucks. Too bad, I really wanted you to like it.