It does have "some" smarts in there M_S, you really think I didn't already take a look ? :)
It's a pretty ordinary looking circuit though except the factory has built with non-identified components :)
I'm happy enough to hang onto it because I completely agree with stadl, it's just about time and so long as a charger has enough "smarts" to stop charging when the battery is back to health who really cares? Just leave it go overnight.
Interesting that you found a Projecta C400 so recently stadl, it is indeed exactly as you describe it. This little SCA is also 4amp, the C400 happily charged up the wife's battery overnight. My mate does not recall how old his is but he was kinda happy to find it when he was looking here in Oz, he had one back on his farm in NZ and it was often pressed into service to revive the batteries in annual use farm equipment. That sort of says big batteries to me :)
It does make me wonder though - every automotive charger I've ever seen, used, owned prior to buying this SCA was a metal vented rectangular cased mystery box with a strap handle, just like the C400 stadl :) This thing is a plastic box not much bigger than say a seven port USB hub, smaller than a typical home router. That's probably why I questioned it :)
Actually this little flat battery thing with my wife's car has been dangerous, to the wallet. We have this horribly steep driveway and her car is at the bottom, my car is behind hers. When the Lancer was deemed dead battery I went looking for my jumper leads - hmm, dunno where those went to. So, have a look at how far her battery is from mine and no way to realistically reverse them to be nose to nose and convince myself that not having jumper leads is asking for a Murphy visit so go to buy some leads. 6m, surge protected, jump start the Enterprise now in my boot :)
It was then that I realised that having an assistant around would be a good idea to jump start the Lancer, I hear what M_S is saying about being confident around DC but by the same token I once had a loose battery blow holes through a bonnet and saw a mate get a screwdriver welded across the terminals - car batteries do deserve respect.
My mate turned up with his charger so the leads are still in the packaging :)
Tool tragic - I confess :)