Temporary end
I am not giving up.
I ran out of five sets of AA alcalines to recharge these tiny 1S 3.7 V .
That is 20 AA cells now too low in voltage to do the charging.
That is also $20 of experimentations.
I will wait till I get a 6 volts DC wall outlet supply with proper polarity to feed this charger.
I do not know how many mAh are needed to recharge one of those heli cells.
I am still so ignorant but I can tell when a set of 4 AAs has dropped in voltage enough that the charger does not work anymore. So I put in 4 fresh AAs and keep going. I m now out of 20 AAs without enough voltage.
Zor