Y ou can manually select 5 modes for charging: 2a, 8a, automatic, 20a, and 25a. When the "Booster" mode is selected, the charging current can reach the maximum value. You don't need to do anything.
25A Smart Battery Charger Maintainer & Jump Starter for Automotive Marine RV
Portable Car Jump Starter,2500A Battery Charger,portable jump starter for car
Automatic Wheeled Battery Charger and Jump Starter for Car, SUV, Truck, and Boat
6/12V 4A Automotive Smart Battery Charger/Maintainer Fully Automatic VF-1005
Portable Car Jump Starter,2500A Battery Charger,car jump starter portable
