Panasonic lumix DC-TZ90 Operating Instructions Manual page 23

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If the computer enters sleep mode during charging, charging may be stopped.
●
If a notebook computer that is not connected to an electrical outlet is connected to the camera,
the battery of the notebook computer will be depleted. Do not leave the camera and notebook
connected for a long period of time.
●
Always connect the USB connection cable to the USB connector on your computer. Do not
connect the USB connection cable to the USB connector of the monitor, keyboard, printer, or USB
hub.
Charging lamp indications
23
Charging lamp
On: Charging in progress
Off: Charging complete
(After charging stops, disconnect the camera
from the electrical outlet or your computer.)
Flashing: Charging error
(For instructions on correcting the problem,
refer to (→285).)
Preparations
Charging battery
DVQP1304