Found this: https://www.aliexpress.com/item/85-...pm=a2g0s.13010208.99999999.259.30453c00OSrVdb
Seems to be ok for charging the 1300 mAh Ni-Mh batteries, especially if I lower the current from 300 to 150.
And the galvanic separation between the transformer coil is helping isolation the main 230V from the rest off the lamp.
What do you think?

And this seems to be like the alternator from the lamp.
If I would want to increase the amount of power sent to battery on each full rotation of the crank, how can I do this?

 

Constant current is 1.25 / R3 = 1.25 / 1.5 = 833 mA

 

Constant current is 1.25 / R3 = 1.25 / 1.5 = 833 mA

Since the thread starter hasn't been seen here since 2019, he's not likely to see your reply.