How about an IMR 18650?The protection will kick in if you drain it too much, but it's not a good idea let it drain until the protection kicks in. You should never really let an 18650 go below 3.7 volts. If you're not going to use a multimeter, I suggest topping it off every day.

Looks good with the black caps, but the Jets' colors are green and white. It shipped already, guess I will have to send it back to Jeff to get the caps redone. Looks great though.