The cordless Lincoln guns aren't built to last imo, or maybe they just don't handle the heavy green syn grease we used at the tractor/heavy equipment shop I used to work at. We could never get a year out of one, inside or outside work. At least their warranty dept was friendly...
If I wanted a new cordless grease gun, I'd look at that Milwaukee. Lose your truck charger? No problem, Home Depot has one. Lose your Lincoln charger? Wait for a new one in the mail. No thanks.