RCA 2-9501 - Manual (Page 7)

5
NOTE: Although you can leave the handset out of the base for extended
periods, you will need to return it to the base periodically to keep the battery
recharged.
TIP: Periodically clean the charging contacts on the handset and base with a
soft cloth or a pencil eraser.
C
HARGING THE
H
ANDSET
'
S
B
ATTERY
P
ACK
Your cordless telephone is automatically charged when the handset is
placed in the base cradle. To maintain adequate power, you need to charge
the battery pack every few days by returning the handset to the base.