How does the Minute Bed Ni-Cd pump work?

PUMP MUST BE CHARGED FOR 24 HOURS PRIOR TO THE FIRST INFLATION. Use the AC adapter to charge your new aero pump for 24 hours. For maximum performance, be sure to fully discharge pump before recharging. After initial charge, charge pump for 12 hours at a time. Charging your pump for periods longer than 12 hours will substantially decrease the life of your battery. For emergencies only, a 3 hour charge will provide one inflation.

To Charge:
a) Remove tiny rubber plug from the hole on the back of the pump.
b) Insert the charger's mini-plug in hole on pump.
c) Plug charger unit into any standard 220 V electrical outlet and let it charge for no more than 12 hours after initial 24 hour charge. (Note: European adaptor also available).