Recently I noticed that XTAR, a specialized battery charger manufacturer, has launched an innovative product, PB2S 2-in-1 power bank. It can be used as both power bank and Li-Ion battery charger. As long as there is an ordinary cylindrical lithium battery, it can charge various devices outdoors anytime and anywhere, which is very convenient. With built-in intelligent detection system, when the battery polarity is reversed or the charging channel is shorted, the charger will not start charging, so as to ensure the safety of batteries, chargers and users. In the event of a short circuit or reverse polarity, the charge current and battery percentage will both be 0.

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. 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. During the charging process, the thermocouple thermometer had been connected and the cover of PB2S wasn’t removed. When charging to 65% capacity, the charging power is still close to 15W. At this time, almost reaching the equilibrium state of heating and heat dissipation. Reading the temperature of the two batteries, respectively at 33.1 ℃ and 33.7 ℃. The temperature of the two batteries is close, indicating that the PB2S balanced well in controlling the dual-slot charging. 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.

XTAR PB2S Red 2 Bay Charger and Portable Power Supply

USB-C and USB-A ports can both be used for output and charge two external devices at the same time.

Soft-Start Function: The soft start function in a power supply circuit minimizes large startup currents from flowing when the input power is first applied. As power is first applied to a circuit, the capacitors must be charged from zero to their final values, while the inductors and transformers need to have their flux stabilized. (Source Sunpower UK) The front-mounted display shows real-time charge/discharge current and voltage, and battery capacity percentage, and supports one-handed button operation to control the charge voltage and current of each battery. The display using the PB2S as a power bank with two 5000mAh batteries inside. In my tests I managed to charge my current samsung S20 smartphone in about 1h20min. The XTAR PB2S Battery Charger is suited for applications where a 18650 battery is required, these applications include torches, laptops, and vaping devices.In the end, it took about 2.5 hours to fully charge a mobile phone and a Kindle from a basic powerless state. The discharge efficiency of PB2S is good. At this time, the remaining power of two 21700 batteries is 20%. The voltage of both batteries is about 3.4V, which is balanced for two-slot discharge. From this, it can be judged that the PB2S discharge cut-off voltage is about 3V, which will not be over-discharged for lithium batteries, making discharge safety.

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. For those who have many 21700 and 18650 batteries, the XTAR PB2S makes full use of the idle battery. It is indeed a very good on-the-go choice. Charging is done simply via a USB-C Cable, XTAR supply this cable (which measures 80.0cm in length) which can also double up us a USB-C output cable to your USB-C device using the USB output port.

Xtar PB2S Charger

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. The size of PB2S is 125 × 58 × 27.5mm, and the weight is only 85.2g. Choose the appropriate battery according to the amount of electricity used. It is suitable for outdoors, travel, and business.