2s battery case, convenient for spot welding and securing 18650 protection board

Recently, when making 18650 battery packs for RC models, I found that the spring battery compartment often loses power, and forgetting to turn off the power caused the lithium battery to over-discharge, so I started trying to spot weld 2s battery packs and added an 80-cent 2s protection board

The battery pack is indeed much more stable, but the battery and nickel strips tend to be misaligned during spot welding, wrapping tape is troublesome, and it's hard to determine the correct wire length for the protection board

So I made a frame to fix their positions and also embedded the wires in the shortest slots

0V connects to the left negative pole, 8.4V connects to the right positive pole, and the lower 4.2V connects to the two poles below

After welding, please use two M2x8 self-tapping screws to seal the cover, then put on heat shrink tubing