Review on 🔋 IEIK Smart Charger for Cars, Trucks, Motorcycles, Lawn Mowers, Boats, ATVs - 7-Stage 12V/6A Automotive Battery Charger & 24V/3A Maintainer for Lithium, LiFePO4, Lead-Acid, and Deep Cycle Batteries by Martin Alvarez

This little charger does what it says on the tin. I have a Generac alternator that requires a 12 volt battery to run. Left the battery outside for a few days and it won't start. I brought the battery into the room, plugged it back in, it still doesn't work. After I bought this small charger, the charger found that the internal temperature of the battery is about 0 degrees Celsius, even though the battery has been indoors for several days. The lead-acid battery was believed to have been chemically frozen inside. I used the charger's repair mode and it looks like the battery capacity has fully recovered. The generator started with no problems! Excellent purchase!