Panasonic ES-SA40 Operating Instructions Manual page 7

Charging
Perform the following steps to charge the shaver if it seems to lose the
speed.
You can fully charge the shaver in 8 hours.
•
A full charge will supply enough power for approx. 7 shaves of  minutes
each.
1
1
Turn off the shaver and
insert it in the charging
adaptor as illustrated.
2
2
Plug in the adaptor into
a household outlet.
•
The charge indicator lamp glows and stays on until the shaver is removed
from the charging adaptor.
7