Sony DSLR-A100 - Manual (Page 148)

148
x On the internal rechargeable
battery
This camera has an internal rechargeable battery
for maintaining the date and time and other
settings regardless of whether the power is on or
off.
This rechargeable battery is continually charged
as long as you are using the camera. However, if
you use the camera for only short periods, it
discharges gradually, and if you do not use the
camera at all for about 8 month it becomes
completely discharged. In this case, be sure to
charge this rechargeable battery before using the
camera.
However, even if this rechargeable battery is not
charged, you can still use the camera as long as
you do not record the date and time.
Charging method of the internal
rechargeable battery
Insert a charged battery pack in the camera, or
connect the camera to a wall outlet (wall socket)
using the AC Adaptor/charger (not supplied), and
leave the camera for 24 hours or more with the
power off.
Charging method of the NP-FM55H
battery pack
t step 1 in “Read This First”