Features:
1. Place 4 18650 flat head batteries and solder free DIY battery cases. (excluding batteries)
2. Battery level display, 4-level LED light displays battery level, intelligent automatic shutdown in non working state. (Note that the battery power is calculated using the voltage calculation method. Please use batteries with high performance and stable voltage. If the voltage drop of the battery is too poor, the indicator light's power will drop quickly, and the output will almost remain in the first and second grids of power.)
3. Easy to install, no difficulty, no need for welding or secondary processing, only the battery needs to be installed correctly and assembled before use. (Note: Please test and use it before installing the baffle. The baffle cannot be disassembled again.)
4. USB output port 5V/2A, type-c5V/2A input port (PD output not supported).
5. Compact and convenient, it is a great companion for home/outing/outdoor sports. The aluminum alloy shell has a frosted surface and a comfortable feel.
6. The motherboard is equipped with anti installation protection, and the battery is installed backwards without burning the motherboard. If reinstalled correctly, it can be used normally, but do not merge one positive and one negative into a damaged battery, which may damage the battery or cause severe aging of the battery. Otherwise, it may cause direct short circuit of the battery, spring burning, and short circuit.

Before purchasing, you must read:
1: Battery that can be used: 18650 lithium battery (without protective plate)
Requirements for connecting to batteries: 3.3-4.2V lithium batteries (18650 lithium batteries): Do not connect to other batteries, such as 1.2V 18650 nickel hydrogen batteries, 3.2V iron lithium batteries, all dry batteries, and 12V lead-acid batteries
2: Charging and discharging protection: The circuit board is equipped with a built-in lithium battery protection IC, which includes overvoltage protection, overcurrent protection, undervoltage protection, etc
3: A 4-pack can accommodate up to 4 18650 batteries (3, 2, and 1 batteries are also fine).
4: Charging input requirements: The most suitable charger is a 5V2A or higher charger, and any other 5V constant voltage power supply can be used as the charging input power supply. Note that PD chargers are not supported
5: After the battery is first connected, it is usually necessary to activate the circuit board to generate an output. If the mobile power supply is not used for a long time, the output will be turned off, and activation is still necessary.

Attention: This product cannot be disassembled. Generally, the problem is with the battery. There are many fake labeled batteries on the market, as well as some damaged and old batteries. Remember not to use them. Please purchase some batteries with good quality and consistent capacity to use, and pay attention to the battery direction before installing. The product is a DIY self-made product. Improper installation or poor batteries can cause the motherboard to burn out.
Test and charge several times, discharge several times, and install the blank again if there is no problem, as the product cannot be disassembled again!

 

Specifications:
Applicable battery: 18650 (flat head -1.8cm in diameter and 6.5cm in length standard) (not included in shipment)
Output: USB interface (high current devices, fast charging phones, phones with a screen size of 5 inches or more, high power, do not use batteries that are too poor, otherwise normal output and inaccurate battery power cannot be achieved.)
Input interface: Type-C port (PD not supported)
Input parameter: Standard current 2A

Package List:
Main board internal material * 1+aluminum shell * 1+baffle * 1