Question about BaByliss E990E

No, but the battery lasts a long time,

No, but it's probably not necessary. It lasts 3h (probably more, but I never measured it), and for the head you need about 5min.
So for me: 180/5=36 shaves.
Lithium-ion batteries usually have a lifespan of about 1000 charging cycles, which is estimated to be 27 years if you cut your hair once a week. By then I probably won't have any hair at all :)

No. Better not use this hair clipper. I cannot recommend it.