LCR-T4 Tester

I am presenting a completely redesigned and optimized case for the popular multi-functional component tester, the LCR-T4. This model solves the biggest weakness of the original—the frequent need to replace the 9V battery—in an elegant and robust manner.My design integrates two special Li-Po cells (e.g., from disposable e-cigarettes) wired in parallel for maximum capacity, along with the necessary charging and power electronics. This extends the tester's operating time to weeks or even months on a single charge! No more worries about battery swaps. Key Features and Enhancements: Extreme Battery Life: Uses two Li-Po cells (max. $\phi$13 x 39 mm) wired in parallel to maximize total capacity while maintaining the nominal voltage of $\approx 3.7 \text{V}$ [See image 05 for component layout].Integrated USB-C Charging: A built-in TP4056 module with a USB-C connector (or equivalent) allows for convenient charging anywhere.Stable 9V Power: The HW-045 Step-up Converter module smoothly boosts