With the intelligent battery charger up to four NiMH batteries of the sizes Mignon and Micro, three baby batteries, two mono batteries or four Li-Ion batteries of the sizes 18650 can be charged simultaneously, also mixed - independant of number, size, capacity or charging status. Each of the 4 charging slots is individually monitored and individually charged/discharged.After inserting a battery, the charging mode starts and charges the battery completely. Each battery is charged separately. This means that rechargeable batteries of different types and with different capacity and charging status can be inserted and charged/discharged. After full charge, the charger automatically switches to pulse charging and keeps the battery charging at 100%. Thus, the batteries are always ready for use and can remain in the battery charging station for a longer period of time. After full charging, individual battery cells can be removed and new ones inserted without affecting the charging process in the other charging slots.Rechargeable batteries inserted upside down and deep discharged rechargeable batteries (NiMH 0.2V / Li-ion 2.0V) are automatically detected and not charged.For professionals, the device offers the option of individually adjusting the charging program and the charging current for each charging slot. You can select the charging mode via the Mode button, the charging current via the Current button. The currently selected setting is indicated by an arrow. If you do not make any settings, the charger charges at 500 mA. If it has to be fast, three batteries can be charged with 1500mA or two batteries with 2000 mA. The charging time is reduced accordingly. In addition, the charger can measure the capacity as well as discharge rechargeable batteries. Regardless of whether you want to charge NiMH batteries or lithium-ion batteries, the charging currents can be selected as follows: 4Ã 500/1000 mA, 3Ã 1500 mA or 2Ã 2000 mA. The discharge current is always 500 mA.The universal charging slots can accommodate battery cells with a diameter of up to 33 mm and a length of 70 mm.All commercially available USB devices such as power bank, camera or smartphone and tablet can be charged via the USB output. Convenient while traveling: One needs only one battery charger for all the terminals and thus saves space as well as weight.This text is machine translated.