Features of this XW-119 DIY power bank:

Batteries are replaceable
Accommodates three or six 18650 batteries
MCU-based design with easy operation
Dual outputs: USB 5V 2100mA and DC jack (3.7V-21V selectable)
High output power up to 70W
3.5-digit LED display showing battery voltage and output voltage
Built-in battery balancing circuits
Built-in protection against overload and over temperature
Allow 3 batteries (output power under 20W) or 6 batteries (over 20W)
Can be used to power notebook computers or work as a UPS for notebooks

Specifications:

Output 1:

USB 5V 2.1A (with voltage selector at 5V position)

Output 2:

5.5 x 2.1mm DC jack: 3.6V/5V/6V/9V/12V/15V/16V/19V/21V 3.3A max.

Input voltage: 16-24V 1.5A DC through 5.5 x 2.1mm jack

Dimensions: 16.2 x 8.2 x 2.2cm

Weight: 110 grams (3.9 oz.)

Housing colors: white top with black bottom and black top with white bottom (subject to stock)

Accessory included: power adapter for charging in (with power cord), output cord for notebook (1m long) and 10 notebook plugs (special ones provided upon request).

No battery is included. (18650 鋰電池需另購)

Useful information:

Polarity of the batteries must be correct.
LED showing 12.4-12.8 means batteries are fully charged.
Charging time required: battery capacity x number of battery x 1.5 / charging current.
Charging time would be affected by diameter of the charging USB cord.

For notebook users:

The XW-119 can be used in three ways with notebooks:

Put fully-charged original battery in the notebook and connect the XW-119. The notebook will first consume the XW-119’s power, and then consume the original battery’s power.

When working as a UPS, connect the original power adapter to the XW-119, and connect the XW-119 to the notebook. Upon power outage, the XW-119 will respond in less than one second.

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