I've done that search too - never found any. They go the other way but not from 4081 battery to 510 atty, unless there's a recent development of which I missed.
There are cartomizers specifically for the RN4081, however, e.g., from Wordup Ecig and Trueman Ecig (China). [Originally tracked down by our colleague, Hellen A. Handbasket.]
But if you want to use 510 attys and cartos, is there really anything that special about the RN4081 battery? You could pick up a $12 Joye 510 battery and $8 USB Charger for $20 total (free shipping) ... a complete two-battery, two-atty 510 (clone) Starter Kit for $25 (plus $5 shipping) ... a Joye 510 full kit for $35 (plus $5 shipping) ... a $22 650 mAh eGO battery and $8 Joye eGo Fast USB Charger for $35 total (including $5 shipping) ... or etc.
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