A Slow charge is usually completed by using a trickle charger. Trickle chargers are available both automatic and guide types, and they are designed to recharge batteries slowly but surely, above extended amounts of time. The 1.25 amps of power furnished makes sure a "lower and gradual" charge, that is https://hukums.com/products/groz-34-inch-impact-wrench-2522-nm-max-torque-6700-rpm-free-speed-ipw401