21700 Power Bank Case Battery Holder Dual USB Type C Charge DIY Shell for iPhone Xiaomi Samsung 21700 Battery Case Storage Box

Features:
1. [Supports fast charging] 2 * USB fast charging output port+1 * TYPE-C interface supports PD fast charging (input/output)+1 * suitable for IOS interface.
2. [Power Display] The amount of electricity used can be monitored at any time, and the power level is clear at a glance.
3. [20 light beads] can light up, 20 light beads can light up, and can also be used as a small night light.
4. [Solder free] Can be used to install 4 * 21700 lithium batteries (flat head) without welding. The batteries can be installed correctly for use. Convenient, fast, and detachable.
5. [Widely used] Mini and compact, capable of DIY battery placement, convenient and fast, essential for outdoor home/travel.
Attention:
Batteries all have a lifespan, and the installed batteries should ensure that their appearance is intact and free of skin damage. The voltage should be between 3.2V-4.2. The internal resistance of the battery will increase over time. If the internal resistance is too high, it will affect the normal boosting of the motherboard and the current limiting of high-power output loads. Remember not to use old/skin damaged batteries, as well as batteries with poor virtual capacity.
This product is a semi-finished part that is prone to damage, so it is prohibited to drop it. The positive and negative electrodes of the battery should be carefully watched before placing it in. Using a flat headed 21700 battery can cause the motherboard to burn out if placed incorrectly, and in severe cases, it can even cause explosions. It is important to remember that purchasing this product requires a certain understanding of the DIY battery box product. If you are not familiar with it, please be cautious when purchasing. 

Parameters:
Supported battery cells: 4 * 21700 model batteries
Product size: 17 * 5.55 * 4.15CM
Color: Black/Orange
Charging parameters: 5V2A/5V3A/9V2A/12V1.5A
Output parameters: 5V2A/15V3A/5V4.5A14.5V5A/9V2A/12V1.5A

Product List:
Main board * 1+shell * 1+front and rear cover plates * 2+screws * 8

Note：
1. Please allow a bit error due to manual measurement. please make sure you do not mind before you bid.
2. The color may have different as the difference display, please understand.

Note: The product only allows the installation of 21700 (21 * 70MM) or 20650 (20 * 65MM) batteries, voltage between 3.5V-4.2V, more than two years of batteries, the number of cycles more than 300 times the battery, basically does not last, found that the charging intermittent, can only be used for a few minutes, more than ten minutes, half the time the cell phone can not be charged, these are all the reasons why the battery is over-performance. In addition the product does not support modification, welding. If the use of non-compliant batteries are not responsible for after-sales. The motherboard is retrofitted with an anti-installation chip, the installation of the reverse does not burn the motherboard, but due to the spring shrapnel is one piece, the battery broken skin, battery short-circuit, a positive and a negative, series connection will cause the burn spring, but re-installed correctly, the motherboard is always able to use normally, will not be burned.