後來查了一下, 錄影中不能充電, 但有插充電線的話, 會用外部電力來錄影
一定要放電池, 電量有可能會變少(表示吃電量太大, 只有外部供電可能不夠力)
http://helpguide.sony.net/cam/1640/v1/en/print.pdf
External power supply of 1.5 A
FDR-X3000/HDR-AS300: Battery power consumption is lessened during shooting/playback
Note
If you turn on the camera while charging the battery pack, charging stops and power is supplied to the camera from the device connected via USB.
You can shoot and play back images using a USB power supply. However, the battery pack is not charged simultaneously.
FDR-X3000/HDR-AS300
To shoot/play back while receiving external power, insert the charged battery into the camera.
Do not remove the battery from the camera when ...