A portable charging device for portable rechargeable electronic devices, the portable charging device comprising: - a rechargeable battery; and - charging control circuitry for controlling a charging of at least one portable rechargeable device, the charging control circuitry comprising: - interface circuitry adapted for electrically connecting the portable rechargeable device to the rechargeable battery, so as to charge the at least one portable rechargeable device from power of the rechargeable battery; - gauging circuitry adapted for automatically detecting a battery charging level of the connected at least one 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 connected at least to the interface circuitry and the gauging circuitry, the control unit comprising a timer, the charging control circuitry being adapted for repetitively: ∘ performing a charging phase by transferring energy from the rechargeable battery to the at least one portable rechargeable device via the interface circuitry until the gauging circuitry indicates that the threshold value has been reached; ∘ entering a pause phase wherein the charging of the at least one portable rechargeable device from the rechargeable battery is suspended, and starting the timer; and ∘ when the timer has elapsed, returning to the charging phase. - a rechargeable battery; and - charging control circuitry for controlling a charging of at least one portable rechargeable device, the charging control circuitry comprising: - interface circuitry adapted for electrically connecting the portable rechargeable device to the rechargeable battery, so as to charge the at least one portable rechargeable device from power of the rechargeable battery; - gauging circuitry adapted for automatically detecting a battery charging level of the connected at least one 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 connected at least to the interface circuitry and the gauging circuitry, the control unit comprising a timer, - interface circuitry adapted for electrically connecting the portable rechargeable device to the rechargeable battery, so as to charge the at least one portable rechargeable device from power of the rechargeable battery; - gauging circuitry adapted for automatically detecting a battery charging level of the connected at least one 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 connected at least to the interface circuitry and the gauging circuitry, the control unit comprising a timer, the charging control circuitry being adapted for repetitively: ∘ performing a charging phase by transferring energy from the rechargeable battery to the at least one portable rechargeable device via the interface circuitry until the gauging circuitry indicates that the threshold value has been reached; ∘ entering a pause phase wherein the charging of the at least one portable rechargeable device from the rechargeable battery is suspended, and starting the timer; and ∘ when the timer has elapsed, returning to the charging phase. ∘ performing a charging phase by transferring energy from the rechargeable battery to the at least one portable rechargeable device via the interface circuitry until the gauging circuitry indicates that the threshold value has been reached; ∘ entering a pause phase wherein the charging of the at least one portable rechargeable device from the rechargeable battery is suspended, and starting the timer; and ∘ when the timer has elapsed, returning to the charging phase.