The BQ-CC51E charger includes 4 AA BK-3MCCE batteries

full charge detection function
overcharge protection
charging time: AA up to 10 hours (2000 mAh)
4 AA rechargeable batteries included
for R6 / AA and R03 / AAA NiMH batteries
possibility of simultaneous charging of 2 or 4 batteries
2 LED indicators
charging control will turn off the charger after approximately 16 hours
typical capacity: 2000 mAh
minimum capacity: 1900 mAh
voltage [V]: 1.2
dimensions: 75 x 118 x 40 mm
weight: approx. 230 g