ProCORE 18V 4.0 Ah battery

The ProCORE 18V 4.0 Ah is a battery manufactured by Bosch for 18 volt Bosch Professional products.

The battery pack contains five 3.6 volt 21700 Lithium Ion cells with a capacity of 4.0 Ah each placed in series to produce 18 volt.

By using the large high capacity 21700 cells the battery pack only needs five of them in order to have the same capacity as the GBA 18V 4.0 Ah battery pack while being both lighter and smaller.

Bosch refers to this battery pack as a "slimpack" because it only contains five cells making it significantly lighter and smaller than "fatpacks" that contain double or triple the amount or cells.

Exterior

ProCORE batteries are fully compatible with all Bosch Professional 18 volt tools but the batteries have a distinct look. To accommodate the larger cells they are slightly wider. They have less red accents and a darker more black color scheme. Although the edges are still rounded the appearance is more angular.

The battery has a black plastic rectangular housing with rounded edges.

On top of the battery is a rail on both sides on which the battery can slide on a tool body or charger backwards. Between the rails are recessed electrical contacts. Marked with "+" (positive) on the left and "-" (negative) on the right.

On top near the front there is a spring loaded latch that secures the battery. A red button on the front of the battery has to be pushed down to release the latch and allow the battery to slide out.

The red bottom has ribs to that act like cooling fins to help dissipate heat faster.

On the back is a push button which can be pressed to activate the battery charge indicator next to it that consists out of five green LEDs.