Chinese devices have standardized on taking 18650 "3.7V" cells for this purpose. We might eventually get back there; maybe the EU will do for e.g. hand tool ba

Chinese devices have standardized on taking 18650 "3.7V" cells for this purpose. We might eventually get back there; maybe the EU will do for e.g. hand tool batteries what they have done for phone chargers and mandate an interchangeable standard.