21700 Power Bank Cases Battery Storage Box Night Light USB Charge DIY Shell 21700 Battery Storage Box for iPhone Xiaomi

Question 1: Does this power bank kit include the batteries?
Answer 1: This is a DIY shell kit and does not include the 21700 lithium cells. This gives you the freedom to source your own high-quality batteries and customize the total capacity and performance of your build.

Question 2: Can I use standard 18650 batteries in this case?
Answer 2: This case is specifically engineered for 21700 lithium cells. Because 21700 batteries are slightly larger than 18650s, you must use the correct size to ensure a secure fit and proper connection with the internal PCB.

Question 3: Is it safe to charge my high-end devices with a DIY build?
Answer 3: Absolutely. The kit features a new generation intelligent temperature control system designed to prevent overheating. Combined with the real-time LED digital display, you can monitor your power levels and charging status with total transparency.