Don Hoover, your entry for the worlds most dodgey battery charger contest is rejected. Way too many parts.
I have several Black and Decker screwdrivers that use the cylindrical "VersaPak" batteries. The charger is nothing but a transformer, one resistor, and the "charging" LED. That's it. They use the charging indicator LED as the rectifier and just cook the battery with half wave rectified AC. The batteries will be damaged the first time you forget them in the charger for more than 8 to 10 hours.
I've bought new batteries and remembered to only put them in the charger for 8 to 10 hours and then remove them, and they lasted fine for a year or two, then I forget them in the charger for a few days and after that their capacity is greatly reduced and they don't hold a charge for more than a few days because of the damage by overcharging.
Also, I have a cheap battery powered toothbrush with an inductive charging base. I took the brush apart once just out of curiosity and the charging circuit in the brush is just a coil, diode, and battery. If you leave it in the base all the time it is always warm. I realized right when I got it, long before taking it apart, that it wasn't doing proper charge control. The warmth is due to the battery being overcharged. So I only plug the charger base in when the brush actually starts noticeably slowing down, and then I only leave the charger plugged in over one night. The thing is, I can use it twice a day for probably two weeks before it needs to be charged again. So that means when most people just leave the charger base plugged in, it's cooking the battery most of the time. It only really needs about 8 hours on charge once every two weeks.
As much as I usually hate the government meddling with things, I've seen so many of these dumb charger circuits that I think they should make a law that requires proper charger circuits that don't kill batteries.