You decide the PB2S capacity. With two 21700 5000mAh batteries, it has the largest capacity of 10,000mAh. You can also use two 18650 3600mAh batteriesto get a capacity of 7200mAh. When the battery power of the phone is 97% and the Kindle power is 91%, PB2S significantly reduces the charging current to ensure the safety of charging. Xtar gave me two batteries, I can use them here to show the battery space, but with only one of each I cannot test them.

A must-have for vapers on the go, the XTAR PB2S Charger is loaded with intelligent features for fast, safe charging. Compatible with 18650, 20700 and 21700 batteries, it’s built from fire-proof material and three-stage charging technology for longer battery life. Plus, it also doubles up as a portable power bank that can last 2 days on a single charge! With a single 18650 battery the charger can easily deliver 0.5A for nearly 4 hours. It shunts down the output when the battery is down to 3V

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Taking into account the error of the instrument, the PB2S's judgment on the charging of different batteries is accurate, and the basic control is within 4.2V of the full charge. The deviation will not be too much. PB2S has three-stage charging (TC-CC-CV). The battery charger uses the float current (TC) to "wake up" and protect the batteries when the battery voltage is very low. After the voltage becomes normal, the charger starts constant current (DC) charging. When the battery is almost fully charged, the charger starts constant voltage (CV) charging, to make sure the battery is fully charged and less damaged.

PB2S is very convenient to use as a power bank. It can charge two electric devices at the same time through both USB and Type-C ports. This is also my favorite function, which is very convenient and fast. At this time, OUT1 and OUT2 will be displayed on the screen, indicating that dual-channel output is in progress, channel 1 is port USB, and channel 2 is port Type-C.Battery charger and power banks don’t exactly have the best reputation, cheaper more inferior products have a habit of overheating and ultimately exploding. But the XTAR PB2S has all the protection that you could possibly want, these include:

The output current display is not very well calibrated, but it gives an idea about the current consumption or the connected device. At 12V the output is down to 1.2A, but as can be seen below the output is depend on battery charge state. The magnetic lid covers your removable batteries, dust-proof and drop-proof. Built-in ribbon, easy for removing the batteries. CV: Når cellen/cellerne er næsten færdigopladet, skifter opladeren over til at oplade med en faldende strømmængde indtil cellen/cellerne når en spænding på 4.2V. Når cellen/cellerne når 4.2V, er opladningsprocessen færdig, og batteriet er fuldt opladet.By pressing the side button and going to slot n.2, the display shows the estimated volts, in real time, of the battery being recharged as well as the 1.7A charging current. The charger is usb powered with a USB-C input and a USB-A output for the power bank function. With the supplied cable it can be charger from a USB-A charger and charge a phone that uses USB-C input. What is not specified is that the USB-C input can also works as a 5V output (With USB-C direction can be automatic selected). On some PB2S the USB-C is marked "in/out". After inserting the battery and pressing the side button, the display shows "OUT1" as output with a battery charge percentage of 98%. The box can also do QC12V, but here the converter has some trouble with a 10ohm (1.2A @ 12V) load, maybe that is the reason it is not listed in the specifications. It maintains the voltage above 11V, this means it will work with most (if not all) devices requiring QC12V and not using more than 1.2A. Over-Current; In an electric power system, over-current or excess current is a situation where a larger than intended electric current exists through a conductor, leading to excessive generation of heat, and the risk of fire or damage to equipment. (Source Wikipedia)

Professionel processorstyret oplader til Li-ion 18650/20700/21700/26650 celler med powerbank funktion The charger generally starts at a fairly high current, this may be fine for 21700 and high current 18650, but it not ideal for high capacity 18650. By charging the battery present in slot n.2, the display immediately shows the percentage of battery charge and the current intensity of 1.7A. When the battery condition of Kindle is better, the PB2S can also increase the charging current to get a faster-charging speed. The power bank can easily deliver the rated 2A with fresh batteries and it has overload protection around 2.7A.When going outdoors, the ability to carry only one battery bank/charger and multiple spare batteries is also a space saver. The battery level percentage is also a very good visual indication of the charge level of your battery. Uses. The USB output port of PB2S doesn’t support QC3.0 and PD protocols, and the output voltage is about 5V. PB2S has OV activation function to revive over discharged batteries. By inserting a battery that is too low, the charger will automatically detect and activate the battery. Batterier med en spænding på 4.1V eller højere, anses som værende opladet af opladeren. For at fuldt oplade sådanne batterier isættes de i opladeren inden denne forbindes til den pågældende strømforsyning. Opladet batterier vil naturligt aflades hvis de efterlades i opladeren. Opladningen genoptages så snart batteriets spænding falder til under 4.1V.