SparkFun PRT-09100 1500 mAh Alkaline Battery – AA
These are your standard 1.5V AA alkaline batteries from Duracell. Don’t even think about trying to recharge these. Roughly 1500mAh per AA cell. Combine 4 to get ~6V peak, and ~4.8V as they hit their discharge curve.
Sold in single units. But if you order four at a time, it makes it easy for us to package them.