Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
Simple construction, lightness, good plastics.
The spring of negative pole is not strong enough to push the battery against the wall of the shell and achieve a balance contact of the positive pole.
Electric cables are really thin. One of the welded joints between rivet and wire broke during assembling.
The 18650 battery is closely fit.
Needs a stronger spring, and would be better to have thicker wire (if possibly, with better welding..)
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