I've got a charger with a timer, a 1 amp trickle charge rate, a 10 amp normal charge rate, and a 50 amp start booster. I think I paid about $40 for it, and it works even after I ran over it with the FJ55 and after about 15 years of rattling around in various vehicles. It even survived the FJ55 12" pine tree severing incident (missed my head by about 6" as it took out the windshield from the inside). I've even welded with it and a piece of coathanger wire in a pinch, but no long beads...

Not responsible for advice not taken...