Sorry man, I was unaware you had 808D batteries.
It is still definitely a good decision to get another kit, whether it be a 510 kit or another 808D kit.
My favorite 808d shop is called "Altsmoke" and they have everything in 808d connection.
You should definitely check them out, they are the besttt 808d shop around.
They will actually give you a free battery if you buy 1 of their kits and post a pic of it & urself in the ALTsmoke free battery thread. They are still doing it, you'll just have to e-mail them after ordering your kit.
Its definitely a great idea to buy another kit though. You may not feel like you need more batteries now, but you eventually will. The cig-alike batteries last 6mo to a year tops. (if you are lucky) and you do notttt want to be caught with only 1 if 1 of your G6 bats die. Altsmoke has a PCC kit. (Personal charging case kit) The PCC is almost 100% necessary if you want to SOLELY use stick batteries. Seriously. You'll thank me later if you take my advice and buy a PCC kit from altsmoke. The PCC allows you to charge 1 battery while its in your pocket, while you use the other one. Its a grrreat and convenient invention. If your batteries ever die while your at work or out of the house, the PCC prevents this 100% and it'll charge 2 batteries many many times while your out of the house, right in your pocket.
If i'm not mistaken, their kits also come with 1 or 2 atomizers, so if you do buy the kit, it'll come with a couple 808D attys. But if you can't afford the 50-60 bucks for the kit now, I'm pretty sure altsmoke does sell 808D atomizers on their own. For 808D atomizers or super shorty cartomizers (both are great for testing juice... although the super shorty cartos do have filler material which can make juice flavors bleed into one another if you test multiple flavors in the same carto) you can also try MadVapes. They are like a vaping walmart. But definitely check out altsmoke man, they even have 808D eGo batteries that will fit everything you've got for your 808 stick bats now.