Rechargeable charger for rechargeable devices, and method for charging rechargeable devices

A charging device (100) for charging portable rechargeable electronic devices (200) is provided. The charging device comprising a rechargeable battery (120) and a charging control circuitry for controlling a charging of at least one portable rechargeable device. The charging control circuitry comprises interface circuitry (110) adapted for electrically connecting the portable rechargeable device (200) to the rechargeable battery (120), so as to charge the portable rechargeable device from power of the rechargeable battery; gauging circuitry (150) adapted for automatically detecting a battery charging level of the connected portable rechargeable device, comparing the detected battery charging level to a threshold value and detecting if the threshold value has been reached; and a processor configured for serving as a control unit (140) connected at least to the interface circuitry (110) and the gauging circuitry (150). The control unit comprises a timer (145). The charging control circuitry is adapted for repetitively performing a charging phase by transferring energy from the rechargeable battery (120) to the portable rechargeable device (200) via the interface circuitry (110) until the gauging circuitry (150) indicates that the threshold value has been reached, entering a pause phase wherein the charging of the portable rechargeable device from the rechargeable battery is suspended, and starting the timer; and when the timer (145) has elapsed, returning to a charging phase.