So, all you have to do is connect the truck/tractor battery charger and turn it on. Of course, the charger will check the state of the battery and charge accordingly.Hence, once the battery is charged, it will be maintained.Of course, the charger keeps your battery in tip-top condition. 12V 30 AH HGV-Battery Charger-Numax Connect-ForgetTherefore, prolonging the health of your battery. ensuring that your truck will start for the first time after the winter break.Last but not least, it is also excellent for use on the farm to charge your tractors.