If you have a 12v battery that is low and around 6v this charger will think it's a 6V battery is fully charged. I had to connect a second fully charged 12v battery to my dead battery and this charger to charge it. Pretty much useless chargers don't buy these automatic ones.
CARKU Pro-10 black/red
91 Review
Xiaomi 70mai Jump Starter Midrive PS01
120 Review
Keep Your Battery Fully Charged With A Smart 12V Charger/Maintainer Featuring Winter Mode
28 Review
Mroinge Automatic 6V/12V Trickle Charger For Vehicles, Motorcycles, Boats And More - Maintain Your Batteries With Ease!
29 Review