The Bosch GAL 18V-40 / 600A019RJ charger is a compact charger for all Bosch Professional power tools that use a compact 18V battery. An 18V battery with a charging current of 2 amps is charged to 80% within 24 minutes.
The modern charger has a charging indicator so that it is quickly visible whether the battery is charged. The light will flash during charging.
More information:
Manual (PDF)