I think you might want to upgrade to full vape gear. If what you are seeking is longer battery life and more control over your vape, that you can use any juice in, then a variable voltage battery is best. Here's my two cents on these:
Stick Batteries, known as eGo Style Batteries (entry level, backup, out and about, stealth, primary):
Trusted Vendors shown, but NOT selected based on pricing, you'll still need to shop around. You will need device specific battery chargers (which often come in kits) for these devices. Also, kits often provide two batteries allowing for simultaneous vaping while charging of the backup. Each of the eGo style batteries below have both 510 and eGo thread connections. As such, they are compatible with most toppers, including most Kanger products. Additionally, each of these devices has at least variable voltage, which allows you to adjust and regulate the battery output voltage, providing customizable vapor production, temperature, throat hit, and finding the "sweet spot" for your juices to suit your individual vaping preferences:
1. Innokin iTaste 3.0 vv/vw, usb passthrough, ohms reader, etc. -
https://ivape.net/index.php/iTaste-VV-3.0-Variable-Wattage-Device-Pearl-Chrome.html (variable power, LCD display, +/- buttons, Usb passthrough, 3.3 - 5.0 volts, 6.0 - 11.0 watts, 800mAh)
2. SLB KGO VV -
http://www.hoosierecig.com/Mega-KGO-VV-1200mAh-3-6v-_p_441.html (LCD display, +/- buttons, Usb passthrough, 3.0 - 6.0 volts, 650 - 1200mAh)
3. Vision Spinner -
Vision Spinner VV eGo Battery 1300mAh (3.3 - 4.8 volts, 1300mAh)
4. Joyetech Twist -
eGo Twist 1000 Mah Battery in Black (3.2 - 4.8 volts, 650 - 1000mAh)
5. Smoktech Winder -
Smok eGo Winder 900mAh Variable Volt Battery (3.2 - 4.8 volts, 900 - 1100mAh)
Best Starter Combo kit out there, imho, provides two batteries, i.e., the twist and/or spinner, and two toppers, i.e., the eVod and/or MT3s, among others:
http://www.myvaporstore.com/Vision_Spinner_Joye_Ego_C_Twist_Combo_p/vvs-c.htm.
Recommend one eVod and one MT3s topper with one Spinner and one Twist to start. This way you get four different products with the kit and allowing you to experience four different setups, as you figure out your preferences and what works best for you. Alternatively, two Spinners with two evods is a safe bet as well, and most users like them a lot. Eventually, you'll want to add a Protank or Davide. Very good clearos. BTW, you can spend less and get a fixed voltage battery, but you'll have much less vape flexibility and it won't be long before you'll want to upgrade to variable voltage, more than likely, and the difference initially is only a few dollars per battery anyway.
There is no right or wrong, only personal preference and experience. Most everyone I see on here ends up upgrading to something more. Seems like MORE, MORE, MORE is a common thread and pattern, almost like an addiction or something...Anyway, do your homework. There's some excellent advice here before this posting. Do yourself a favor and opt for longer battery life in the beginning. Recharging is a PITA and gets old real quick. YMMV, so maybe lower works for you, but it doesn't work for most, except as a backup, stealth, and out and about batt. Keep that in mind. The suggested kit remains an excellent backup for years to come if you do upgrade to an APV later. People end up wasting their money when they buy something that they NEVER use again. Anyway, my two cents. Welcome, congrats on quitting, good luck, happy shopping, Power Up and Vape On!