How I Built a 119,000mAh DIY Power Bank from 34 18650 Batteries A Step-by-Step Guide.
How I Built a DIY 119,000mAh Power Bank Using 18650 Batteries
As a digital nomad, having a reliable power source is essential, especially when working remotely. Building a DIY power bank not only meets my specific needs but also provides an opportunity to learn about electronics. Here’s a detailed guide on how I constructed my DIY 119,000mAh power bank using 18650 batteries sourced from AliExpress.
Why Build a DIY Power Bank?
Higher Capacity: I needed a power bank that could charge multiple devices, including my laptop and smartphone, several times without needing a recharge.
Cost-Effective: Building my own power bank was significantly cheaper than purchasing a commercial power bank with similar capacity.
Learning Experience: This project allowed me to deepen my understanding of battery technology and electronic assembly.
Customization: I aimed to create a power bank with features like multiple USB ports, fast-charging capabilities, and an on/off switch.
The Components I Used
To build my DIY power bank, I gathered the following components:
Battery Cells: I purchased EVE 35V 18650 3500mAh batteries, which provide a reliable power source. For a total capacity of 119,000mAh, I used 32 cells.
Battery Case: I found a detachable 32*18650 power bank case on AliExpress that allows for no-weld assembly and features QC3.0 quick charge capability.
USB Ports: Multiple USB output modules were included for charging various devices simultaneously.
Charging Module: A charging board that supports both input and output charging, crucial for managing the power flow.
Miscellaneous Components: Items like wires, a soldering iron (if needed), and switches to provide added features.
Assembly Process
Preparing the Battery Cells: I started by ensuring that all 32 EVE 18650 batteries were charged and in good condition. This step is critical for performance and safety.
Arranging the Cells: Inside the power bank case, I arranged the cells in parallel configuration to achieve the desired capacity. Each cell's positive terminal connects to the next cell's positive terminal, and the same applies for the negative terminals.
Connecting the USB Output Module: I chose a USB output module with multiple ports and wired it to the battery arrangement, ensuring robust connections for optimal power delivery.
Integrating the Charging Module: The charging module was connected to manage input charging and maintain safe operating conditions, including overcharge and discharge protection.
Final Touches: After ensuring all wiring is properly secured and connections are insulated, I enclosed everything in the case and added an on/off switch for convenience.
Testing
After assembly, I conducted several tests to ensure everything was functioning correctly. I charged multiple devices simultaneously and monitored their performance. I also tested the quick charge functionality to verify that it worked as intended.
Conclusion
Building a DIY 119,000mAh power bank using 18650 batteries has significantly enhanced my portable power capabilities. Not only am I able to charge my devices multiple times, but I’ve also gained valuable insights into battery technology and electronics. This project has underscored the importance of reliability in remote work situations and provided me with a tailored solution to meet my power needs.
Detachable No Welding DIY 32*18650 Power Bank Case Battery Storage Box QC3.0 Quick Charge For iPhone Xiaomi Huawei Battery Shell (be sure to click on the one that has the wireless charging)
EVE 35V 18650 3500mAh 10A Battery ($2.50 Regular price$4.99)
