Regarding mAh ratings, the posts in this thread indicate that it's all about longevity. I'm having a hard time relating that to my personal experience:
Using a KR808 manual passthrough on a powered USB hub, I got good vapor. One day, I forgot my hub on a trip to another city. I went to a store and bought another USB hub.
Problem: negligible vapor ... basically sucking air.
I went looking for an answer. The new powered hub was 500mAh. Upon returning home, I checked my faithful powered hub and found it to be 1200mAh. So I attributed the vast difference in vapor production to the mAh rating.
I have a Big Chuck on order, and want to buy the safest, most vapor producing batteries for it. I was ready to buy the AW LiFePO4
AW LiFePO4 3 Volt Lithium Rechargeable Battery
until I saw the 500mAh rating. 500mAh has burned me before, and I don't want to get burned again.
Can anyone shed some light on the situation?
Thanks,
Rick.
From what I've gleaned in this thread, I wouldn't attribute it to the mAh at all, and look for other reasons, voltage, etc. mAh is indeed the measure of longevity, in milliamp hours, and as Drozd has provided even for the layman who doesn't know jack about the innermost workings of batteries (read: me) tons of insight.
As far as the batteries you're looking at for 6v Chuck vaping, I'll be going with those too I believe, I'd prefer the safest stacking solution available over a little longer lasting power. However I'll be trying both ways of course since variety is the spice of life, and some LR atties to boot!
Anyways, I think you may have just gotten a dud of a hub, or one that doesn't spit out the voltage it stated. Did your atomizer seem to get flooded at all?
Granted, I'm probably talking out my .... here, so if anyone else has corrected insight to lend, by all means.
Very very close...it's the amp draw of the PT (dependant on voltage and resistance) versus the Amps that the hub is capable of...
You are confusing 2 different things:
mA - the rating of your USB hub - defines the maximum current draw possible through the device
mAh - the storage capacity of the battery - (current * time) - so if the Chuck draws 1000mA and you hold the switch down for 1/2 hour straight, the battery will be drained.
The 500mAh rating shouldn't be a concern from a power / vapor perspective, it just means the battery will hold about 8 hours of normal vaping charge. An LiFePO4 battery will provide sufficient power to make the Chuck work well.
Oh very close...I'd say this is true of the AW LiFePo4....not just any LiFePo4
Rick...these guys have it mostly...like 98% on the button...
on batteries you have to look at the mAh rating combined with the battery's C rating....
on the PT the mA rating in relation to the amp draw of the voltage and atty/carto combination...
First lets look at the PT situation.. I don't know if it's a 5V PT...but I'm gonna assume that it is....I'm also gonna assume a standard KR808D-1 cartomizer on it...
a standard carto at 5V has an amp draw of 1.67A or 1670mA (it's voltage divided by resistance to get amp draw by the way)
so that's what your PT really wants...the powered hubs usually have their rating and a peak rating (though usually no one tells you the peak rating)
so your PT wants 1670mA....one hub is giving it 500mA...and the other 1200mA...so yes it makes sense the 500mA hub is weak, it's capable of less than a third of the amperage...(some companies make it easy and just rate the amp draw of the PT though)
Now the 3V AW LiFePo4 batteries...
like I said its a factor of the mAh combined with the C rating...that figures out your max drain rate and you compare that to your amp draw..
so it works like this:
500(mAh) * 10(C rating on that battery)/1000 =<5A
so it's capable of up to 5000mA over 6min continuous (you have to divide the minutes in an hour by the C rating)
now I'm guessing you're looking at these batteries for 6V (and I don't know what atty or carto) but we have to look at amp draw at that voltage..
A standard carto has an amp draw of 2A at 6V...so well less than the max drain rate of 5A for that battery...
further you can kinda work the problem backwards given the amp draw knowing that the full capabilities of that battery..
so with a standard 3Ω carto at 6V on those staced 3V AW LiFePo4:
2000ma(amp draw)/ 500(mAh of the battery)= 4C (discharge rate(remember that AW battery is capable of up to 10C)
60min (a milliAmp hour)/4(c rate we're discharging at)= 15min (continuous) or 900seconds or roughly 300 3second long button presses..
now take my comment at the begining of this about "not just any LiFePo4"....take the tenergy 3V LiFePo4 manufacturer say that it has a max drain rate of <550mA (.55A) ...again Amp draw on that carto is 2000mA...you're overstressing the battery by almost 4 times their capability that's going to lead to premature battery death and possible venting issues
