4 x Energizer Power Plus R6/AA Ni-MH 2000mAh Rechargeable batteries
Markings: HR6/MIGNON
Description: Rechargeable Nickel-Metal hyritic
Voltage [V]: 1.2
diameter [mm]: 14.5 in
Height [mm]: 50.5 in

Can be recharged up to 1000 times

A charged Energizer Power Plus battery left unused for 12 months retains as much as 80% of its initial capacity and can be used in devices.

Product specifications are available here