Bluetooth keyboard is the use of Bluetooth technology keyboard, wireless digital devices, all have batteries. If the keyboard is built-in lithium battery, then the use of lithium battery and mobile phone is the same, are the first three times the charge time is slightly longer, usually with the charge can be used.
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If it is a keyboard that can be charged, you can check whether there is a usb interface on the left and right sides of the keyboard, there is no charging, and some can be charged directly into the phone line.
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Generally, it is displayed in green during the recharge process, and it is red after the recharge is completed. The recharge time is 2-3 hours, and it is OK to use normally after the recharge is completed.