Bosch 2-Tool 18-volt Power Tool Combo Kit with Soft Case (2 Li-ion Batteries Included and Charger Included) in the Power Tool Combo Kits department at Lowes.com
New Bosch 18V 5.0Ah Battery Pack
BOSCH Pack 8 outils 18V 5Ah - 0615990K9H
Teardown: Bosch 18V Core18 4Ah battery. I've never seen anything like this! - YouTube