Apple wireless Bluetooth keyboard power supply mode is 2 AA (No. 5) batteries, due to the limited battery power, non-rechargeable batteries, do not need to turn off the keyboard power for a long time (long press the key), in order to save power, but also protect the keyboard from damage.
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If you're running low on power, you can also use The Magic Bar, an Apple Bluetooth keyboard rechargeable battery that has more power and durability than the No. 5 battery. But it is best to turn off after use and charge regularly.