I have had good luck with the Schumacher chargers at work. Currently I run this one. https://www.jbtools.com/schumacher-...-12-24v-manual-wheel-battery-charger-starter/ I know it's a big one but I just thought I would throw it up since I love it and want one for home. The handle is tall for tall guys like me. Regular charger handles are always that awkward height where I'm like partially bent over trying to drag the damn thing. This one does it all 6/12/24 volts. Fully manual. Trickle charge up to 24 volt boost. I detest auto chargers! I've also used Associated brand commercial chargers for semis a lot and they were good quality. Not cheap to buy though.