Hi, I had just bought a battery charger that has 50/10/6<>2 amp settings. When I have a dead lawn mower battery, I am so confused on what amp to set charger at to charge it. I hear some say 2 amp slow charge is best, some say they do 10 amp. Not sure what is right. No interest in a battery tender or maintainer. Just need to know what amp to set charger at.