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The capacity and firmness can be assessed only after a long period of use. A very important note for the first time: the actual charging process begins about an hour after the connection. Obviously, first an initial formatting, the power adapter accepts no visible power from the wall outlet and the charging light flashes orange. Since a flash is generally regarded as warning or error message, you might start from a defect. In short manual for the Asus keyboard of this initial condition is not mentioned in the initial start-up. But he is normal.
Now, after just over a month operating time of battery has proven its quality. He works in the keyboard as a supplementary power source for the Asus tablet and 'pushes' its stored electrical energy in the battery over. This leads to a total prolonged period of operation.