Radio Shack 43-144 User Manual page 7

About once a month, fully discharge the battery by
keeping the handset off the base or charger until LOW
BATTERY stays lit. Otherwise, the battery pack loses its
ability to fully recharge.
If you are not going to use your phone for an extended
period, disconnect the battery pack. This increases the
battery pack's usable life.
If you have trouble installing the battery pack, take the
handset to your local RadioShack store for assistance.
Warning:
• Dispose of old battery packs promptly and properly.
Do not burn or bury them.
• There is a risk of explosion if batteries are replaced
by the wrong type.
• Dispose of used batteries according to the
instructions.