In addition, the product does not support modification, welding. The motherboard is retrofitted with an anti-installation chip, installing 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 burn.
eBay
Heltec 21700 Storage Box 16.8V Power Wall 21700 Battery Holder 21700 Power Bank Case 4S BMS Lithium Battery Balancer 60A 120A
Aliexpress UK
Can be installed 4x flat 21700 lithium battery(battery not included). 1x 21700 Power Bank Case(Batteries not included). The power bank case needs to be welded with batteries in parallel. Office Supplies.
eBay
Diymore PD 65W 100W Power Bank 6-port 21700 two-way fast charging mobile power module for High capacity 18650 battery assemble
Aliexpress UK
Can be installed 4x flat 21700 lithium battery(battery not included). 1x 21700 Power Bank Case(Batteries not included). J Fountain Pen Piston Remover Tool Opener Wrench Kit For Pelikan Montblanc 146. Underwater Dimmable Diving UV Filter Lens Cover Kit For GoPro Hero 4 3+ w.
eBay
Portable Battery Box Tpye C USB 5V2A Power Bank Case 18650/21700 Mobile Power Kits DIY Charger Box Kit Universal Cell Phones
Aliexpress UK
Can be installed 4x flat 21700 lithium battery(battery not included). 1x 21700 Power Bank Case(Batteries not included). Assorted 10 Sizes Chronograph Watch Pusher Button Clip Circlip Snap Ring 150PCS.
eBay
LiitoKala PB-L01 22.5W Portable Charger: Fast-Charging Power Bank with Removable 21700 Battery, Ultra-Light for Travel & Gaming
Aliexpress UK
Charging Long life batteries Nice looking battery bank with light.
eBay
Winter-Ready PD100W Fast Charging Power Bank Shell for 6×21700 Batteries DIY High Capacity Case Laptop Phone Charger Housing
Aliexpress UK
Applicable battery models 18650/18700/20700/21700 lithium batteries, flat/tip/all compatible. A variety of interfaces with free choice, more convenient to use. Also note that monitor settings may vary from computer to computer and may distort actual colors.
eBay
Portable DIY POWER BANK CASE 4*21700 Battery Charger for Mobile Phones - Storage Box Shell with 5V 2.1A Charge Capacity
Aliexpress UK
Can be installed 4x flat 21700 lithium battery(battery not included). 1x 21700 Power Bank Case(Batteries not included). The power bank case needs to be welded with batteries in parallel. Child Proof Door Lever Lock Door Handle Locks with Adhesive Handle Safety lock a.
eBay
DIY Power Bank Case for 21700 Cells 100W PD Fast Charge Shell Only Ideal for Travel Backup Laptop Phone Charging
Aliexpress UK
Can be installed 4x flat 21700 lithium battery(battery not included). 1x 21700 Power Bank Case(Batteries not included). We're engaged in DJI accessories, console & arcade parts, military models and so on.
eBay
Winter-Enhanced PD100W Power Bank Shell, 6×21700 Battery DIY Housing, PPS/PD3.0/QC3.0 for Laptop Phone
Aliexpress UK