Radio Shack Pro 84 - Manual (Page 7)

7 The Basics
Warning: Set the ALKALINE/RECHARGEABLE
switch to RECHARGEABLE only when using nickel
cadmium (Ni-Cd) or nickel metal hydride (Ni-MH)
rechargeable batteries. Never attempt to recharge
non-rechargeable batteries. Non-rechargeable
batteries can get hot or explode if you try to
recharge them.
Cautions:
• Use only fresh batteries of the required size and
recommended type.
• Always remove old or weak batteries. Batteries
can leak chemicals that destroy electronic
circuits.
• Do not mix old and new batteries, different
types of batteries (standard, alkaline, or
rechargeable), or rechargeable batteries of
different capacities.
When flashes and the scanner beeps every
15 seconds, replace both batteries.
Warning: Always dispose of old batteries promptly
and properly. Do not bury or burn them.
using rechargeable batteries
You can also use two rechargeable batteries to
power your scanner. Before you use Ni-Cd or Ni-MH
batteries, you must charge them.