Welcome to ECF Logan!! Congrats to you both and best of luck on your journey to be smoke free!
also pass throughs are another good back up for batteries if at home or in a car. And they are usually about $20 or less.
Tornado eGo-C 1000mAh Manual USB Passthrough Battery - Black & Brushed Steel
I do use this one - I never needed the USB - they last THIS long!!! tremendous!!!
This one is cheaper yet the same as the one you just linked.
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Just be careful with all the copes out there, Joyetech eGo there are some good knock offs out there but I have never had the cheaper versions last as long as the 1100mah from joyetech. If you want to go even bigger get yourself a big old mod but the good ones are not cheap.