Unitech PT-500 - Manual (Page 7)

6
Insert the batteries in the positions as shown
by the polarity symbols inside compartment
4. Replace the battery cover and move the latch back to
the locked (centered) position.
5. If you are using NiMH battery pack, please charge
the NiMH batteries continuously for 14 to 16 hours
with AC-DC power adapter, or 3 hours with the
optional charging and communication cradle.
Note: The AC-DC power adapter is only for NiMH battery
pack recharging. It won’t recharge alkaline batteries.
Do not incinerate, crush, or puncture batteries.
Do not dispose of alkaline batteries in fire.
Do not attempt to recharge alkaline batteries.
Backup Battery
The PT-500 also has a built-in rechargeable Lithium backup
battery that temporarily protects data stored in RAM. The
power of the Lithium battery is only consumed when the
main power source is not available, such as when the main
battery is removed or discharged. When a functional NiMH
battery pack or 3 AA-size batteries are in the main battery
compartment, power is provided to backup the RAM
memory and system clock, which effectively puts the Lithium
battery in a standby state.
The power circuitry of the PT-500 monitors the voltage level
from the main power source and automatically connects the
Lithium battery for backup once it has detected that
inadequate power is being provided by the main power
source. Under these conditions, the life of the Lithium
battery would be up to 10 hours. Therefore it is highly
recommended that the main battery always be kept
adequately charged inside the unit.