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The funny thing is, I didn't notice any drop off in vapour production. Suddenly it just stopped working. No sputtering, juice in the mouth, bad taste, or anything else I am used to with a regular 510. It just died and the LED flashed to let me know the battery is dead. With a regular 510 battery I have experienced a drop off in vapour production and have even topped the juice up, assuming it needed more juice, only to be drinking that juice as it dies.
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Cheers,
JaYBoNeS