I didn't think of that. I guess we can have 2 threads about the SX Mini Q then. One about the mod and one about the batteries. I'll go ahead and start a new thread and then post the link here.
SXmini Q Class Powered by YiHi SX450 chip
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I didn't think of that. I guess we can have 2 threads about the SX Mini Q then. One about the mod and one about the batteries. I'll go ahead and start a new thread and then post the link here.
OK here's the link for the new thread about the mod only. SXmini Q Class Powered by YiHi SX450 Chip Part 2 
Just speculating here and trying to get the thread back on track.....
I'd be very surprised if this is more than $200 as I think they will have real trouble asking more, too much competition. What makes me hopeful is it looks to be more zinc alloy than stainless which is cheaper and easier to manufacture, no stainless battery tube with threading or a stainless battery cap like on the ML. Also the sx450 might have a new name but from everything I've seen its the same spec as the sx350 but being dual batteries capable of higher Watts (did you see how I avoided saying capable of 200watts there, doh I just said it! Lol)
Hey I'm hopeful, ill definitely be getting one. I just want those replaceable covers to be Rock solid, magnets are a nice idea but rarely hold doors in place with no movement at all, I hope Yihi did a good job!
I'd be very surprised if this is more than $200 as I think they will have real trouble asking more, too much competition. What makes me hopeful is it looks to be more zinc alloy than stainless which is cheaper and easier to manufacture, no stainless battery tube with threading or a stainless battery cap like on the ML. Also the sx450 might have a new name but from everything I've seen its the same spec as the sx350 but being dual batteries capable of higher Watts (did you see how I avoided saying capable of 200watts there, doh I just said it! Lol)
Hey I'm hopeful, ill definitely be getting one. I just want those replaceable covers to be Rock solid, magnets are a nice idea but rarely hold doors in place with no movement at all, I hope Yihi did a good job!
I think YIHI wants to be known as the Rolls Royce of mods and they'll keep prices artificially high like they did with the M and ML.
I started a new battery safety thread that includes other 200 watts mods that use 2 18650 batteries that the battery experts can go nuts in.
200 Watt Mods Battery Safety
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Yeah, they need to adjust their game to the market. Look at the Vapor Flask. If I have a choice of an SX chip or a Joytech chip and there's a $160 difference, then I'm going for the Joytech.I think YIHI wants to be know as the Rolls Royce of mods and they'll keep prices artificially high like they did with the M and ML.
I started a new battery safety thread that includes other 200 watts mods that use 2 18650 batteries that the battery experts can go nuts in.
200 Watt Mods Battery Safety
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Bingo. You nailed it. Yihi have a following, much like ProVape. Nobody cares about cheap Chinese companies. Yihi have earned a better reputation - the best of the Chinese companies perhaps. The decision to allow 200W on 2x18650's however is hurting that reputation.
Will *I* still get an SX450? Sure... but I won't be using it at 200W - I know better than that.
One thing you're both not accounting for is that the battery will not be 4.2V under load. At 200W, it will have about a 1V voltage drop (sag), so a fresh charge would be about 3.2V and a 3.3V cutoff (as found in YiHi's other mods) would actually be about 2.3V under load. Using those new numbers, you're attempting to pull about 40A - a dangerous load at a dangerous voltage.
Even if your batteries could handle it a few times, you're doing damage every time, and you will have a problem at some point - it could even be while charging (both internal and external charger). Time will tell...
Sorry, but if you use realistic voltage sag numbers, that's not the case.
Have you ever even LOOKED at your SXmini's battery meter on a full charge at high wattage? It disappears. That's a 1V drop, at 60W. What do you mean by "realistic"?
You're making your argument based on a battery bar, which is an approximation of battery life/capacity (just ask anyone with a DNA40 how reliable that is). Meanwhile, based on the discharge curve for the VTC5 at 35A at 35A continuous, one doesn't reach 3.2V until around 400mAh of capacity is consumed. Further, in a preheat condition we're only doing pulse discharges, which depending on the length of the pulse (typically on the order of a few 100ms), so voltage sag is not as bad as a continuous discharge (as voltage sag is not instantaneous).
So in summary, 200W is more than feasible with 2 18650 batteries. It won't be able to do it anywhere near as long as a 3S configuration, provided battery tech doesn't improve, but c'est la vie. Does it degrade the battery capacity faster? Sure, but that's true of any increased use of current in a Lion battery, unless active cooling is employed. In addition, who's to say someone won't employ a 2S2P battery configuration or use LiPos with the chip. Finally, just because something is capable of a certain limit doesn't mean people care that it always performs at that limit. For example, I doubt you're always driving your car with the speedo maxed out.
Funny..... new thread (Part 2) created to get away from talking about battery safety and clutter in this thread and what are they talking about in Part 2 but batteries and cluttering that thread up. 
I guess some people think there's something else to talk about in a new thread about an unreleased product that we have all the information the manufacturer has released so far...
I'll try to refrain from such discussion over here any more... "try"
I guess some people think there's something else to talk about in a new thread about an unreleased product that we have all the information the manufacturer has released so far...
I'll try to refrain from such discussion over here any more... "try"
Me too.... refrain....refrain....try..... maybe a Part 3 with no talk about batteries at all....
Back to 2 cell batteries and 200 watt vaping:
Say someone want to vape a 0.15 ohm coil at 200 watts with 2 cell 35 amp batteries.
Safe or not???
I should have said "over there" - with 3 threads it's hard to keep track of where I am!
The coil resistance is irrelevant to the current being pulled from the battery. It only affects the current being drawn from the chipset. To get to the desired wattage, 200W in your example, depending on the coil resistance, the chipset must boost or buck (increase or decrease) the voltage being provided by the battery. The effect on the battery is the same... 200W is 200W regardless of the atomizer resistance, and the same amount of power is being drawn from the battery.
That's an oversimplification, keeping it simple, as there are factors such as efficiency of buck vs boost, losses due to extreme sub-ohm resistance, etc., but within a very small difference, 200W output will pull the same current from the battery.
No, not even close to "safe". "Safe" in electronics design is 50% of any rated component's maximum ability. Most good batteries these days are rated for at least 20A. I'll use ProVape for an example, since they're very well known to put safety as the first criteria in their designs. The new Radius is a single 18650 design, and is limited to 40W and/or 9.5A output current. The maximum draw from the battery would be 10A, which abides by the 50% design rule.
If YiHi wanted to design a "safe" mod with dual 18650's, it would be limited to 80W. If you want to push the limits to 100%, which is not a good idea, it would be limited to 160W. I'm talking about the CDR rating, not the "pulse" rating, since there is no standard definition of "pulse" and it's so easy to start doing internal damage to the battery without even knowing it, which increases the odds of a catastrophic failure, especially as the battery ages.
I know some people don't like comparisons to the DNA200, but look how much power is being pulled from each cell at 200W - 66.6W each. YiHi's original SXmini was a 60W mod with a single 18650. DNA200 dual 18650 mods are limited to 133W - same 66.6W/cell. Still more than you'd like to see if safety is your primary design goal, but "relatively safe". 100W/cell is not at all what I would call "safe" by any stretch of the imagination. Others can choose to agree or disagree - it doesn't change my opinion. I've had 4 years of electronics classes, remember what I was taught, and have done many simple designs, but I'm not an electronics engineer - those are the real professionals, such as the high-end engineers working at ProVape.
While most of us won't vape at 200W, there are some who will. This discussion is for them. I doubt I'll go much over 50-60W (took me forever to upgrade the M-class firmware that allows 75W), since I haven't needed more than 60W so far, and tend to stay in the 30-50W range. At that wattage, the new SX450 is perfectly safe.
Funny..... new thread (Part 2) created to get away from talking about battery safety and clutter in this thread and what are they talking about in Part 2 but batteries and cluttering that thread up.
That's because you keep popping over and posting about batteries. So far you're the only one posting about batteries over there.
Deleted wrong thread... sorry deleted post
Will add this....lots of battery posts over there by lots of folks.....
Hyperspace:
I ask that you re-read "over there" and see who first posted (see post 5 & 6) about batteries and also how many have others have posted about batteries. I believe my first post was a qoute of a post from Yihi that the Q would do 200 watts with a 35 amp battery ( SXmini Q Class Powered by YiHi SX450 Chip Part 2 ) . That was an informational post and not just a discussion post on my part (only posting what Yihi said).
Please edit your last post here to reflect your findings or verify that I am the only one who has posted about batteries.
Thanks
Will add this....lots of battery posts over there by lots of folks.....
Hyperspace:
I ask that you re-read "over there" and see who first posted (see post 5 & 6) about batteries and also how many have others have posted about batteries. I believe my first post was a qoute of a post from Yihi that the Q would do 200 watts with a 35 amp battery ( SXmini Q Class Powered by YiHi SX450 Chip Part 2 ) . That was an informational post and not just a discussion post on my part (only posting what Yihi said).
Please edit your last post here to reflect your findings or verify that I am the only one who has posted about batteries.
Thanks
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From the ML thread:
SX Pure, the SX pure is a atomizer spcially for SXmini series products which we planned to release this year
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