Bosch 18-Volt 2-Pack 4 Amp-Hour; 4 Amp-Hour Lithium-ion Power Tool Battery in the Power Tool Batteries & Chargers department at Lowes.com
GBA 18V 4.0Ah Battery Pack | Bosch Professional
Bosch 18v Lithium Battery Can Be Used For Electric Hammer Drill Electric Screwdriver 18v Battery Bosch Professional Power Tools - Instrument Parts & Accessories - AliExpress
2 x GBA 18V 4.0Ah + GAL 18V-40 Starter Set | Bosch Professional
PCB Circuit Board For Bosch 18V Li-ion Battery Housing Case Set | eBay
Teardown: Bosch 18V Core18 4Ah battery. I've never seen anything like this! - YouTube