These are your standard 1.5V AA alkaline batteries from Panasonic.
1250 mAh Alkaline Battery - AAA (Energizer) - PRT-23156 - SparkFun Electronics
Description Includes Documents The Experiential Robotics Platform (XRP) is a hands-on, comprehensive robotics platform and includes everything needed
Experiential Robotics Platform (XRP) Kit - Beta
Panasonic Aa-size General Purpose Battery Pack - Alkaline
Panasonic AA Alkaline Plus Battery Retail Pack - 2 Pack
Model: No. 5 / LR6 / AA Alkaline battery. Height: 50.5mm.
Panasonic - AA Size - Alkaline Battery - Industrial Grade - 18 Pack - LR6
Experiential Robotics Platform (XRP) Kit - Beta - KIT-22230 - SparkFun Electronics
The eneloop pro Ni-MH Low Self Discharge batteries utilize Panasonic's advanced rechargeable battery technology providing up to 2550 mAh of power (AA batteries) and the ability to be recharged up to 500 times. The eneloop pro battery cells deliver consistent power performance, maintain 85% of their charge for up to one year, come pre-charged by solar power and are ready to use out of the package.
Panasonic BK-3HCCA8BA Eneloop Pro Battery - AA - NiMH
1.5V Batteries Panasonic Industrial Devices
Rechargeable Batteries, Rechargeable AA Batteries
Panasonic - AA Size - Alkaline Battery - Industrial Grade - 18 Pack - LR6
Panasonic K-KJ17MZ104A eneloop Power Pack; 10AA, 4AAA, and Advanced Individual Battery Charger, White : Electronics