I have a Schumacher MC-1 charger. Battery was bought and placed in its location but not hooked up while I replaced the engine. Was charged overnight for good measure before hooking up and starting the vehicle for the first time after engine replacement. It has been hooked up normally ever since (approx 2 months). Vehicle ran and charged properly 14.3-14.8v depending on load and has not sat for more than a week without being started and ran for at least 10 minutes. I’ve used my MC-1 on the under hood points twice while going through diagnostics to keep charged while going though scans and tests since I knew I was going to keep the ignition on for longer than 10 minutes with the engine off to diagnose a K can/ backup camera issue.