I can agree with both those statements...perhaps they arent the most clear and going into detail
a battery pushing a true 3.7V is indeed a significant difference and improvement over a 3.2V battery...
*here's the qualifier....there are no stock batteries and even very few mod batteries that deliver a true 3.7V without voltage sag and overstressing the batteries because of the amp draw the atty/carto is asking for compared to the max drain of the battery..
the whole as many combinations of KR8...I'd agree with that statemnt too but with the qualifier
* that qualifier being that yes cartos are available all the way down to 2.0Ω (litecigs I believe) and up higher than 3.5Ω (it might require some dectivry to get the #'s out of the vendors)... and then the 901 is threaded the same so it'll fit a KR8 battery without adapter and those are available in a huge range as well (down to 1.5Ω) but yes the 901 is technically a different device than a KR8 (just like a 306 is technically different than a 510 even though they are the same threading)..
every 510 atty I've bought have been genuine joye and have metered in between 2.2Ω and 2.5Ω...
same with the 306 atties every one has been 2.5Ω -2.8Ω...
the problem is more that I see vendors that arent forthcoming with the info as far as resistance...or sell an off brand/clone of a product and neglect to include that info as what's considered standard or LR does vary by manufacturer...
a good example of that is you have the 1.5Ω LR atties...and then you have 1.8Ω ones and 2.0Ω ones from different manufacturers because to them they are LR because their standard are either 3.0Ω or 3.5Ω...
because of the 510's popularity all sorts of clones and knock offs are out there which yes gives us a huge selection of resistances : I've seen 1.5, 1.7, 1.8, 2.0, 2.2, 3.0, 3.5, 4.5, and 5.2 now and what's standard for joye isn't standard for SLB, or eastmall, or hello, or bauway...
and the same is true for the cartos...just happens that the arbitrary resistance from a lot of the manufacturers of those are the same...
just cause you asked for a link...heres some 2Ω 808d-1 cartos
KR808d-1 Premium LOW RESISTANCE SOFT CAP Blank Cartomizers
my point is...I'm sorry that you feel you wasted or lost alot of money....
however when in doubt....ask someone around is bound to know or at least give you a good lead...
and often because the market IS so open and unregulated without standards for specs much of it could be put on vendors and the lack of information on the products they carry...
and yes it is unfair for new people to be expected to know to ask these things.. often they only see the model # and the price...they don't kow that there's going to be a difference in (for example) the 510 that cignot carries, the 510 that TV carries, and the 510 that EM carries...or a difference between the KR808 that v4L carries, the one that vapornine carries, and the one that puresmoker carries....