I have a borrowed NAPA battery charger to get my Scotts lawn mower going.. The charger says 12 volts 6 amps. The battery says it needs 300 amps. I was able to get the battery going yesterday by giving it a boost from my Subaru. Then it died shortly thereafter when I put it into reverse. We tried to boost it with a pick up truck, but no luck. Thje NAPA battery indicates it is 100% charged. I don't know what settings to use or what to expect. I do know how to hook it up.