Set of 4 AA NiMH Batteries 2000mAh 1.2V eneloop Sanyo SY 29088 (Accessory)
This is Panasonic, Sanyo not (it has a pinch, it does not matter, apparently since late 2013 Eneloop are manufactured by Panasonic). But it is not a 2000mAh, 1900mAh but. Well, I do not know if it will make a difference on longevity, as the keyboard