Review on IEIK 12V 8A 24V 4A Automotive Smart Battery Charger Maintainer for Car, Truck, Boat, Motorcycle, Lawn Mower, SUV, RV, ATV & More - Yellow by Greg Baker

This charger doesn't like small AGM batteries like NP7. If you parallel 2 together then it works fine. Large batteries seem fine. The restore function works fine. I have several NP7 racquets that have been sitting for over a year and when 2 are tied together everything is fine. Some were below 12V (11.6) and did not come back to life. It's most likely not the charger. Normal charging and repairing large batteries is normal. I used the repair function on 200Ah 11.5V AGM batteries and everything went fine. I don't know yet what the payload will be. Overall not a bad device.