Allan Jones submarines!, page-20

WW2 subs were electric with diesel charging motors rechargeable at periscope depth

Now the latest which we are not getting are -
The National Interest

However, there’s reason to believe that AIP submarines can, if properly designed, swim underwater even more quietly. The hydraulics in a nuclear reactor produce noise as they pump coolant liquid, while an AIP’s submarine’s engines are virtually silent. Diesel-powered submarines can also approach this level of quietness while running on battery power, but can only do so for a few hours whereas an AIP submarine can keep it up for days.