I got 10 cells of NiCd batteries, each 1.2 volts / 240 Ah, connected in series, so the 12 volt system is present. Every cell can have 13.7 to 14.0 volts vhen full.
It is strange that my wind generator ( 125 watts Piggot's design) charges them very fast. So, with the wind of about 18 kmh ( 5 m/s) , they come from 9 volts to 13 volts for about an hour.
Also, what's been charged fast, drains fast, so when I connect two H4 lamps, every of 60 watts, I can see my voltmeter is going down.
I think that those batteries haven't seen the charger for a while before I got them, so capacity fall down...
What can I do to restore battery capacity???
I read somewhere to discharge them to minimum, then to charge them with very high amps, and do about three such cicluses, and then to charge them with nominal voltage ans manufacturer's suggested amperage..
I am a bit afraid that MY BATTS ARE DEAD!!