Amazon.com: AA Batteries - USB Rechargeable Double A Lithium Batteries - Li- ion Battery Cell - 1.5V / 1700mAH (4-Pack) - Not NI-MH/NI-CD/Alkaline Batteries - ECO-Friendly and Recyclable - No Memory Effect(Green) :
DEWALT LITHIUM -ION 20 V vs NiCd18 V BATTERY TEST - YouTube
BU-501a: Discharge Characteristics of Li-ion - Battery University