Compex SP4.0 - Manual (Page 19)

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When this has finished, if the battery is working properly, it will start charging; in this case, it is strongly
recommended to perform a charge/discharge cycle for the battery by pressing on the channel 4 button
to launch this cycle, which may take up to 12 hours. If, however, it proves to be faulty, the following screen
appears and the battery must be replaced.