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Question about cartridges
(reddthat.com)
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I think the resistance of the coils are finicky too, I’ve fixed some carts by putting it on a battery with adjustable voltage and turning it to max. Makes it work with the other batteries again. So try a newer fresher battery, older batteries loose voltage over time and may not be able to trigger the coils with current charge.
Could likely be partly to do with the wicking as well affecting the coil resistance.