Buck-boost stick based on Happy Vaper booster

[slimest]

Hi everybody. Here is my new battery mod with varivolt and built-in charger. The purpose was to make very compact and light weighted device "all-in-one": varivolt, passthrough, charging from a standard micro-USB cable. Also device is supposed to be used the whole day without recharge.
I used the great booster from Happy Vaper as DC-DC converter, AW IMR battery 18650, small USB charger board (modified) and self made electronic button on MOSFET.
Here is result:

 

[slimest]

Here is my device without the cover. Micro USB cable connected - testing charger.

 

[asdaq]

I like it, it reminds me of the Gripper but full featured. What is the case made from, did you mold it yourself?

 

[slimest]

Yes, I made the case from glassfiber tissue with epoxy. Then glassfiber covered with very thin natural leather (old passport cover, made by turkish and bought in London оn a flea market very, very long time ago )
Actually the case is a tube. The case wall is about 1.5 mm including leather. Outer dimensions (without atomizer) 80x38x23 mm.

 

[Dougiestyle]

I'm interested in more information about the VV DC-DC booster and what you did to modify the charge circuit. Which chrage circuit did you use? Please provide links for components used. I would like to build a similar mod.

 

[slimest]

OK. I purchased this board (couple in parcel): 2Pcs USB 5V Lithium Li-ion Battery 1 Cell Charger Board | eBay
I tested it, and it works perfect: 4.20 volts maximum charge voltage.
Of course I cut some "spare" board parts and got very small board approx 14 mm in diameter. Schottky diode on input was repositioned and resoldered.

P.S. Actually you don't need this big diode, but I prefer protection, so I kept it on its place.

 

[slimest]

About the booster. You can get more information in official FAQ from developers: http://www.e-cigarette-forum.com/forum/happyvaper/202635-ego-booster-faq.html
This is a great, great device.

 

[slimest]

This is the schematic diagram of the mod:

 

[asdaq]

Leather, wow, very nice workmanship there, it is hard to make out that it is leather in the pics. My Beast measures similarly at 84 x 32 x 21 minus protrusions (there are quite a few), so I can imagine yours fits very nicely in the hand, and in the pocket. Respect.

 

[slimest]

Dear asdaq, leather is a little hard to work, but if you are just an amateur as I am, there is simple rule for leather: use stones and sandpapers, no files, add water, and leather will be yours. Thank you for your comment

 

[r77r7r]

That's all I've ever wanted in a PV. Wish you could be a supplier. Thanks for showing your work.

 

[slimest]

Thanks, this system was my dream too. I never will be a supplier. Anyway I will be happy to share any knoledge about this system. Just ask On my home forum (russian language) I put 25 photos about the mod. If you wish to know something, welcome.

 

[zer0ith]

That is awesome slimest! Excellent use of the eGo Booster

 

[slimest]

Thank you! You just ask me, how I fixed the booster in the body. It was mostly complicated task
I wanted that the booster could be released from my mod absolutely intact, just in case. But it has to be fixed very reliably, because you screw in and out atomizers. So I choose the pin construction. Drilled 2 holes in the booster body (1.3 mm) so, that through them goes still wire, very hard. This wire goes without messing to connector. Then I positioned the booster with the wire on the board with a rubber o-ring and used an acrylic compound to fix the wire. Important to rotate the wire by pliers before the compound hardens, otherwize you can have difficulties to remove it.
That's it. You just make a needed piece of wire as a pin and always can fix the booster or remove it.

 

[slimest]

Oh, I forgot about the button. Here is its photo and schematic. Nothing special, usual mosfet switch. In this mod instead of the atomizer connected booster.