When you use the lamp until the battery is totally empty, the protection circuit of the battery will switch off. This is no problem for the battery - but if you use your own charger, it might not detect the battery as its voltage is too low. Some chargers have a possibility to "jump-start" charging in this case (the "Pocketlader" has a special mode for this in some firmware versions), check the manual!

Our Mascot charger works fine in this case if you connect the battery before plugging in the charger!