Fine, always presumed 306 = l88b. I could be mistaken. I ask for a 306 addy, I get something Blu sized.
You are mistaken. That's called compatibility. Presumptions have no place in the new members forum when answering a question. It causes people lots of problems.
Accepted. I have my Blu wall wart right here, still hunting up my USB charger.
I don't understand what you're trying to prove here... If you don't have a multimeter to check a battery from the Blu and E-cigs Brand (they're not Models), then I'm not going to debate this with you. I also don't know if they've changed the battery recently so that issue is moot until we know for sure.
Someone with an older Blu kit reading this wouldn't know what to think... E-cigs are a fairly new Branded model and there isn't any information on the forum about it. Best to tread lightly when making recommendations.
It's your money and your supplies... charge at your own risk if you don't care to know for sure. Unless someone puts a multimeter on the batteries of the Blue/E-Cigs, I can't see recommending or guaranteeing that it's okay to do this.
I have positive it is, or so close to 510 it makes no odds. The ONLY difference I can see is the positive post on the USB charger, it's recessed ever so slightly so standard 510, including a real Joye 510, won't make contact.
Reversed polarity isn't something you can see in the connections, nor would it be noted on a charger.
The ONLY difference I can see on the cartomizer end is they are slightly larger, as in I can't put them on 3.2v T-rex and put the cone on, the carto blocks the hole. The charger looks identical to many KR8 chargers, and the fit is identical to my KR8 addy's, so I strongly suspect they are just using KR8 with 510 connectors. I can't say this for a fact. Maybe they're just using thicker paper for the carto, I dunno. In any case "e-cigs" (formally Knight Sticks) is so close to a 510 it makes no odds.
When it is another model entirely, it does and I don't think you understand Chinese manufacturing and how they make these models. Small differences such as diameter, a difference in the number of threads on a connection end, air channels or holes for air flow, height set of the center positive post (or negative as the case may be for one that has reversed polarity), etc. makes a huge difference in compatibility for a battery, how/if it will fit in a charger correctly or in a PCC.
Voltage differences in batteries are another problem... some atomizers won't perform well on a compatible battery because of this or because they have regulated power. You should always use the Charger that came with the batteries you have, or buy the model you have to begin with when you get a starter kit. Otherwise, there are no guarantees your battery is going to work right (if at all).
Compatible thread Atomizers can be swapped around usually with no problem, but not always. Example is a 901/KR808D. The air channels on the base of the KR808d cartos make problems when trying to use them on a standard 901 because the 901 batteries don't have air flow channels cut that are needed to keep the KR808 carto from feeling like sucking mud through a straw. An adapter is needed for a 901 battery in order to use a KR808 carto.
It's battery will charge on a standard 510, standard 510 batteries don't make contact to the + post.
Contact to the + post of what? The E-cigs or Blu PCC? Like I said, atty compatibility doesn't guarantee battery or charger compatibility. As far as charging, I don't know enough about the reversed polarity to know if it will actually charge even though it is eventually ruining your battery/charger.
I can throw just about any addy on the E-cigs (formally Knight Sticks).
That's not true, well at least not without an adapter. Only 510 compatible atomizers such as 306, L88b, Joye 510 and 510 generics are going to work. Center post contact issues can be a problem when mixing atomizer models/batteries.
A 401, 801, 901, KR808d-1, 302, RN4072, RN4075, BE112, 4081 (etc...) atomizers WON'T work on it. I'm positive.
E-cig's cartomizers work just fine my t-rex, e-power, Joye 510, and generic 510 batteries.
Sure E-Cig's cartomizers will work on those models... they're 510 compatible (either L88b, 306, or 510 model). That doesn't mean spit when it comes to the batteries of those models.
This isn't my first e-cig model compatible rodeo... 
I had the Blu shortly after it first came out and it had a reversed positive/negative then.
I've had at least the atomizer from every single model we've talked about in this entire thread, if not full kits with chargers/batteries as well as generic/knock off products of those models. Compatible atomizers doesn't mean total compatibility. These manufacturers make small changes because they want you to only buy their model. They could care less if you eventually fry the competition's batteries when you try to charge them in their chargers.
I'd hate for someone to start charging a Blu or E-cigs brand on a 510 just because you said you were positive without actually testing the battery for reverse polarity... it very well may be totally compatible now... they may have changed how they make them, or Blu/E-Cigs may be using a different manufacturer now that doesn't make their batteries with the reversed issue.
Fortunately, they're still compatible with other atomizers/cartomizers.
Thing is, if it has reversed polarity, you need to know so you don't buy an extra (Joye 510) battery that will be ruined and/or ruin your charging case/charger.
