How long does it take to charge the EMP? 12 May 2026 06:54 Updated You can charge the electric mini pump in approx. 25 minutes using the USB cable supplied (A 5V/2.1A charger). Related articles Can I see the current charge status on the EMP? How long does it take to inflate a bicycle tyre with the EMP? How many tyre inflations can a fully loaded EMP manage? Does the EMP save the last tyre pressure setting? Can I display the tyre pressure with the EMP?