Zebralight and green Panasonic NCR18650GA

You would be right, the tail spring in the SC64 is about 23mΩ uncompressed and this sort of pogo pins are usually rated at 20mΩ max, typically less, so 4mΩ max.
In the H600 it’s about 50mΩ which is pretty bad for the current drawn on H1 (5~6.3A)

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