Howdy mrmiter;
Glad you stopped back. Don't be such a stranger.
I'm still using my 4081 too. I split my vaping between the 4081 and a 510. Love em both!!
I'm getting away from the stock batteries. I have a Protege for my 510, and just picked up a DSE905. The DSE905 is a Chinese copy of the screwdriver. They come in 901, and have adapters to fit the 4081. It's cheaply made, but I thought I'd try it. Complete mod with two 14500 batteries and charger, 901 atty all for about $65.00.
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The 14500 batteries last me about 2 days on a charge. They have their own version of the Janty Stick too.
I'm getting ready to post an instructional sheet on how to build your own heavy duty Passthrough for about $5.00. It should be ready to post by tonight.
jd