mrb

that's pretty cool...

precisely what i am after,,, 3.7 volt with detatchable cord for portability... so, with protected batteries, theoreticly , the circuit inside the battery will automatically regulate whatever charge i give it... be it plugged into my computer, or plugged into my 2amp wall charger? also, excactly where would i attatch the usb cord wires to...the opposite pos and neg posts? I don't want it to bypass the battery while i am using it..right? i agree that adding a bunch of different components just improves the odds of failure.... the more you add, the more can go wrong. someone else here asked why i used such a small switch... well..., this was my first build. I ordered the parts from an ecig store thinking that they will sell me what is best for the application. I now understand that i need to make sure the switch is rated for around 3 amps or so. also, i didn't add a "bunch of epoxy" because if i applied it to both sides it would be difficult to open up the case to repair. I also try to keep it as clean as possible.. they can get messy can't they. there have been a lot of great comments here,, thank you everone!

thanks for the boost Chris!

that is a pretty slick idea! just would need to make sure the charger fits the specs for the battery being charged is all. but, to stick with my original plan: if i could find a really good source of information on batteries and what they need for charging..(mAh, volts etc) then i could figure out what diodes, resistors and stuff i would need to adjust the current from a usb port. I appreciate your suggestion.

I have been vaping for about a month now,,and have significantly reduced my analogs down to about 3-4 cigarettes per day,, from 1.5packs a day... I am still trying to find that "sweet spot"...almost. I am posting here because i just found this forum and signed up, therefore cannot post anywhere else yet. I built a 5 volt mod ... I would like to build a 3.7volt box mod that I can use a 2-3 "AA" box. My question: has anyone figured out how to add a usb cord to the box mod, so that the batteries can be charged through a usb port or usb wall wart, instead of having to recharge the batteries in a separate charger, and then change batteries. it would be neat to be able to make this box mod like a sit and go passthrough,, only with better batteries. what batteries would be best, resistors?, can this even be done. i am still researching batteries.. kind of confusing. if anyone can point me in the right direction, thanks.