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!