every 15 seconds, replace both batteries.
Using Rechargeable Batteries
You can also use two rechargeable batteries to power your scanner. Before you use Ni-MH or Ni-Cd batteries, you must charge them.
The scanner has a built-in circuit that lets you recharge Ni-MH or Ni-Cd batteries while they are in the scanner. To charge the batteries, set
REG. ALK. BATT./NI-MH BATT. inside the battery compartment to NI-MH BATT., install the batteries in the scanner, and connect an optional external AC adapter to the scanner's DC 6V jack (see “Using AC Power” on Page 19).
Setting Up Your Scanner
17

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.

5. Replace the cover.

6. When flashes and the scanner beeps

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Image 17
Uniden UBC72XLT owner manual