Battery size in WD My Passport Wireless 2TB

Does anyone know how large the battery (Ah or mAh) in the ‘WD My Passport Wireless 2TB’ model is?

I recall being told by a WD manager who frequents this board that the mAhrs is around 10,000, which makes sense since it lasts a few hours. Check the full manual, it might even tell us.

I’ve seen in some review it was 6000.