Ultratec 4425 - Manual (Page 76)

Replacing the batteries
Replace the batteries every two or three years, or when they run
down in less than 30 minutes and exercising them does not help.
Use only AA NiCad rechargeable batteries. Turn over the
Superprint 4425 and follow these steps to change batteries:
74 • CARE & REPAIR
CAUTION!
The rechargeable batteries contain nickel and cadmium. Do not burn
or puncture them. If you do, they could release toxic material that
could injure you. Do not dispose of them in household trash. For
information about recycling or proper disposal, consult your local
trash collection or disposal organization.