Eneloop rechargeable NiMH batteries AA size pack of 4 from PANASONIC.
Nickel metal hydride
Long service life (charge up to 2100 times)
Low self-discharge (up to 70% capacity after 10 years)
Ready to use pre-charged batteries

Technical specifications BK-3MCCE/2BE
BK-3MCCE/4BE
Rated voltage:    1.2 V
Type:    AA size
IEC:    HR6
ANSI:    AA
Capacity:    1900 mAh
Technology:    nickel metal hydride
Charging current:    2.000 mA quick
Charging time:    1.1 h quick 
Dimensions:    Ø 14 mm x 50 mm
Weight:    28 g/112 g