Yes, you are safe if you have bought authentic Sony VTC5's (there are lots of counterfeit VTC5's out there (Amazon & Ebay to name a few)
If you unfamiliar with battery safety, Ohm's Law, amp draw, etc. I highly recommend you spend some time with Baditude (one of our resident battery experts) and visit his blogs.
Baditudes Blogs.
batteries
9.
Battery Basics for Mods: IMR or Protected ICR?
* Another essential read to understand which
batteries are safe to use in mechanical and regulated mods. Includes a frequently updated list of recommended safe-chemistry, high-drain
batteries with their specifications.
17.
Purple Efest Batteries not as Advertised
* A cautionary blog that reveals that the purple Efest batteries may not have the specifications advertised. Also includes a commentary on "continuous discharge ratings" vs "pulse discharge ratings" of battery specs.
OHM'S LAW
14.
Ohm's Law for Dummies (Vapers)
* My attempt at explaining Ohm's Law in layman terms and how it relates to vaping.
16.
Explain it to the Dumb Noob: Ohm's Law Calculations
* As simple as it is to use, some people have a tough time grasping the concept. Warning: Includes graphic photos of mod explosions.
BATTERIES - WHERE TO BUY
Only buy batteries from a reputable supplier (not ebay or Amazon) as there are many counterfeit batteries being sold. Here are several reputable battery suppliers in the US.
*
RTD Vapor
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Illumination Supply
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Lighthound
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Orbtronics