Bosch ProCore 18V 4.0ah vs Standard Bosch 4.0ah - YouTube
Replacement 14.4V 18V Bosch Lithium Ion Rechargeable Battery 3ah 4ah 5ah 6ah for Power Tool Drill Set Bat607 Bat611 - China Bat607, Bat611 | Made-in-China.com
BOSCH 06019H410A GSR 18V-28 - 18V Cordless drill driver in case with 2 4Ah batteries and charger, 0 - 500 / 0 - 1.900 rpm, Ø screws max. 8 mm | Mister Worker®