Battery Voltages -- Surprise!

[JW50]

As mentioned earlier, the eGo Twist is relatively recent news to me. But since "discovery" I have come across several reviews of the eGo Twist. Of all that I have watched, all very positive. A review by pbusardo that I thought good can be found here: A PBusardo Review - eGo Twist - OvaleUSA - YouTube . Also, a very good review by SteelJan here: http://www.e-cigarette-forum.com/fo...view-joyetech-ego-c-twist-torture-review.html . SteelJan's review mentioned that manufacturer's voltage curve that I mentioned previously and in her opinion the "puff" scale shown in that chart should be multiplied by 10! That is, instead of 180 "puffs" and 27 minutes - more like 1800 "puffs" and 270 minutes. SteelJan also did some testing. The two tables below come from her review.

Load 2.6 ohm Boge Carto
Setting/ Avg Volts/ Current/ Watts
3.2 volts/ 3.22/ 1.32 amps/ 4.2
3.7 volts/ 3.55/ 1.46 amps/ 5.2
4.0 volts/ 3.87/ 1.60 amps/ 6.2
4.4 volts/ 4.22/ 1.75 amps/ 7.4
4.8 volts/ 4.85/ 2.04 amps/ 9.9

Load 1.2 to 1.5 ohm DC Carto
Setting/ Avg Volts/ Current/ Watts
3.2 volts/ 3.19/ 2.47 amps/ 7.9
3.4 volts/ 3.49/ 2.68 amps/ 9.3
3.7 volts/ 3.48/ 2.69 amps/ 9.3
4.0 volts/ 3.46/ 2.65 amps/ 9.2
4.2 volts/ 3.46/ 2.66 amps/ 9.3
4.6 volts/ 3.43/ 2.65 amps/ 9.1
4.8 volts/ 3.43/ 2.65 amps/ 9.1

Interesting that the LR DC carto tops out in terms of watts at a relatively low voltage. Also interesting (to me anyway) that greater watts obtained with the higher resistance carto at high setting. She also mentions an apparent 4 second "puff" limit at higher settings.

 

[Rocketman]

Not really that surprising given the 2.5 amp limit (about 2.65 amps per SteelJan).
The 2.6 ohm carto never made it up to 2.5 amps, and the 1.2 to 1.5 (?) ohm hit the current limit early at about 3.4 volts.
Looks like her LR carto was 1.3 ohm when hot.
(A common problem with 1.5 ohm cartos at the low end of the tolerance).

Now, as far as getting watts out of a Twist, without going over 2.5 amps, what resistance and what voltage setting would give the most watts?

 

[progg]

To the liquid consumption: I was closely monitoring when I arrived at the 1.8ml figure. I haven't since then (using the twist as my workday, away device) but can say it's been approx. the 1.8ml, and have been varying the voltage between 4.0 and 4.6. This seems in line with SteelJan's 1800 puffs / 270 mins. As to the amp limit, Kent C inquired about it and posted this in 'Dangerous':

Regarding the 'changeable' aspects of the coils... whether one can just buy the coils only, for replacement (like eGo-c heads) .... I got this from Wayne at heaven gifts today: (also a note on the amp limit on the Twist- a question in 'eGo-types' that was lingering )

Thank you for your order. Yes, we have ordered 1.5ohm, 1.8oh, 2.2ohm and 2.5ohm coil units for those Coil Changeble cartomizers. They are delayed by the factory, but will soon be listed on our website. Some 1.8ohm Coil Units will be available in a few hours.

The MAX current limit on the ego c twist battery is 3.0A, I got the information from the Joyetech engineer.

And from Neon:

So as per Newsunshine @ healthcabin, the limit isindeed 3 Amps.

 

[JW50]

Not really that surprising given the 2.5 amp limit (about 2.65 amps per SteelJan).
The 2.6 ohm carto never made it up to 2.5 amps, and the 1.2 to 1.5 (?) ohm hit the current limit early at about 3.4 volts.
Looks like her LR carto was 1.3 ohm when hot.
(A common problem with 1.5 ohm cartos at the low end of the tolerance).

Now, as far as getting watts out of a Twist, without going over 2.5 amps, what resistance and what voltage setting would give the most watts?[/QUOTE

Thinking about maximum watts with 2.5 amp current limit. Highest from SteelJan info is 9.9 watts but amps at only 2.04 (but voltage 4.85). So, so it seems to me, no higher voltage space. Would seem with 2.5 amp limit and 4.8 volt setting limit, highest possible about 12 watts. Calling SteelJan's DC carto 1.3 ohms suggests to me that that max would occur somewhere between 2.6 and 1.3 ohms. So saying max watts is at 12 implies (by ohms law, perhaps not applicable here) that 12= I^2 *R. If I is max at 2.5 then R needs to be 12/(2.5)^2. Or R needs to be 1.92 or, say approximately, 2 ohms. So, at at 2 ohm load maybe a current of 2.5 amps and volts at 4.8. Kind of guessing somewhat, but my answer to what resistance and what voltage is 4.8 volts at 2 ohms and producing 12 watts.

 

[Rocketman]

I tried it with a 2 ohm atty and a 1.5 ohm DCC, 1.7 ohm SCC, 2.6 ohm SCC.
Yes, you have to consider amp limit when you pick a resistance.
If Jan's carto was 1.3 ohms, that is probably too low for the eGo Twist, or the regular eGo, and is pushing the 'reliability envelope' just a little.


2 ohm DC (I didn't have any) at 4.4 to 4.8 volts would probably be pretty good with the twist.
Using low resistance with the Twist and hitting the protection stop is a good way to shorten it's life

 

[DC2]

So then my 2.3 ohm standard Joye 510 atomizers would be about perfect for the Twist?
That would be great, because I have about 75 of them.