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http://h10032.www1.hp.com/ctg/Manual/c02728168.pdf4. How do I charge battery?
The quickest and preferred method is to use the supplied AC adaptor with the USB cable. You can use the supplied USB cable with a PC or laptop to recharge as well. Please note that if you use a laptop, please make sure it is plugged into an AC source so that it’s battery is not depleted. The camera must be turned OFF; blinking light confirms charging, and the light becomes constant after the charging is completed.
In AC charging Mode, the light will turn itself off automatically after a short time. The full charge time is about 3 to 4 hours. (Actual charging time may vary depending on the condition of the battery.)
貌似没限制。