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D Batteries
If you’re restoring an older flashlight, a fresh set of D batteries is the easiest way to make sure your brightness test is actually fair. I like starting with known-good batteries so the before/after comparison reflects the reflector repair—not a weak power source.
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Pros
- +Reliable way to verify real light output during testing
- +Easy, inexpensive baseline for before/after comparisons
Cons
- -D-cell lights can be bulky compared to modern rechargeable options
What Your Review Channel says
“Uh takes 2D batteries, old vintage kind of light”
