Battery Charger Box 

Features: 

• A DIY power back case, can charge 4pcs 21700 batteries (Batteries need to be welded, and not included)
  
• Support full protocol fast charging 22.5W, two-way PD fast charging 20W.
  
• 22.5W output supports PD QC- AFC SCP- multi-protocol fast charging for laptop phone universal
  
• You can take it on the plane without declaration, safe and reliable
  
• Transparent body, imported high-quality LED screen can check the remaining power in real-time

Specifications: 

• Material: ABS-PVC
  
• Color: Black, white 
• 30 000Amh