I just received the 10 85uF 440V capacitors. While in the US I will connect all 10 to get 12A average with 45A max. My batteries are rated 5C (charging) so with 10Ah up to 50A should be OK.
I will of course put a selection switch for 85uF/850uF (to slow charge when I have time).
My current charger is pretty complex with 70uF cap, SSR, rectifying bridge, electrolytic caps, resistors, Arduino, 5V power supply...
In the next one I'm eliminating the electrolytic caps, resistors, Arduino and the 5V power supply.
The end of charge will be determined by the pack voltage. I'll use a resistive voltage divider to bring the voltage down and compare it to a reference with a LM311. Since the current needed is really small I'll use a resistor and a zener as the power supply. No stabilization as discussed previously - an oscilloscope is on it's way from Hong Kong so I can see what is really happening when one charges Lipo with impulses