Battery safety and Sub Ohm vaping...

[conanthewarrior]

I found this but this particular listing was ended:
Torchy (Samsung 25R) 2500mAh Flat Top 18650 3.7v Li-ion batteries

http://www.ebay.com/itm/2x-30A-Torchy-Samsung-25R-2500mAh-Flat-Top-18650-3-7v-Li-ion-batteries-case-/121771448970?hash=item1c5a24da8a&nma=true&si=x9OShcwlYFldMIRIs4Jqit3IYDk%3D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

Ok, so out of those it seems the 25R performs better? That is good. My only question now is do I continue to purchase 25R's, or go for 30Q's. I just don't know if the capacity will make a huge difference due to the cutoff we use in our devices-like that is right down to 2.5V, above 3V seems to be just under 500MAH for all those batteries-so are we actually getting better life, or is only 500MAH actually available to us?

 

[billy_idle]

Ok, so out of those it seems the 25R performs better? That is good. My only question now is do I continue to purchase 25R's, or go for 30Q's. I just don't know if the capacity will make a huge difference due to the cutoff we use in our devices-like that is right down to 2.5V, above 3V seems to be just under 500MAH for all those batteries-so are we actually getting better life, or is only 500MAH actually available to us?

I'm really not qualified to answer that. It's all a bit confusing to me really. I vape between 20-40W on 0.15-0.5Ohm coils and just need to change the batteries once a day. I'm a bit of a chain vaper though so for me that is all I need. The batteries charge up quicker than they run down at the moment so I'm happy lol.

 

[Tubbyengineer]

Most mods measure the resting voltage of the batteries so the charts are only half the story but they do make it possible to compare cells against each other. Given the curve for the VTC4 and 30Q the 30Q is clearly ahead, I haven't had any 30q's yet, I'll be getting some at the beginning of december - next payday. It's been a quite expensive month, A Crius, Aromamizer Full kit, PG, VG, Nic Base, 2 lots of concentrates, 50ml of Shade, 2 30ml of Vamp vapes American desire range - Oh and A Wismec Reuleaux, so half a dozen 30Q's will have to wait until next month...

 

[al_g]

I'm placing an order for some 30Qs...Jim (Torchy) emailed me this morning with some info...

The 30Q seem to perform as well as the 25R but give longer vaping time. I know they are being used in 200w snow wolfs. 20-25A is well within the safety or performance margins.

The Samsung data sheet shows that 30Q have 100% capacity at 10A (and 0.6A), 97% at 15A, 95% at 20A and so on. I have tested them up to 40A continuous current, and the capaicity only really drops off above 30A. They also don't get as hot as VTC5 at 30A.
I think Samsung rate them at 15A because that is the current at which they will maintain 60% capacity after 250 discharge cycles.

He comes across as a very knowledgeable guy. I'm sure he'll be happy to answer any questions via email.

I have no experience of the VTC5, 25R or 30Q so compeletly reliant on information provided by the experts.

 

[al_g]

Samsung 30Q batteries arrived today, great service by Torchy.

Based on what we know and the tests that have been done, should we be confident that pushing these to 20amp on a regulated mod is safe?

 

[Beastie]

Yep especially on a regulated device they'll work well. Torchy had run them higher but best to stick to the recommended limits

 

[paulc]

This is the first time in my life that i wished i'd paid more attention in physics!

Are my Samsung INR 18650-29E SDI 2E72 batteries safe to use in a Snow Wolf TC 75W? Probably for use with Kanger Subtank mini
Spec below, but please note they are iNr rather than iMr
Normal use?
Sub Ohm use?
Or are they simply not high enough discharge for Snow Wolf?

Thanks for looking


Official specifications:

• Nominal Capacity: 2,850mAh (0.2C, 2.50V discharge)
• Typical Capacity: 2,850mAh (0.2C, 2.50V discharge)
• Minimum Capacity: 2,750mAh (0.2C, 2.50V discharge)
• Charging Voltage: 4.20 ± 0.05 V
• Nominal Voltage: 3.65V (0.2C discharge)
• Charging Method: CC-CV (constant voltage with limited current)
• Charging Current: Standard charge: 1,375mA
• Charging Time: Standard charge: 3hours
• Max. Charge Current: 2750mA (not for cyclelife)
• Max. Discharge Current: 2,750mAh (continuous discharge), 8250mAh (not for continuous discharge)
• Discharge Cut-off Voltage: 2.50V
• Cell Weight (max. (g): 48g
• Cell Dimension: Diameter(max.) : 18.40 mm, Height(max) : 65.00 mm,
• Operating Temperature: (Cell Surface Temperature) Charge: 0 to 45°C, Discharge: -20 to 60°C
• Storage Temperature: 1 year : -20~25°C, 3 months : -20~45°C. 1 month : -20~60°C

http://www.candlepowerforums.com/vb...Review-of-Samsung-INR18650-29E-2900mAh-(Blue)

 

[Beastie]

This is the first time in my life that i wished i'd paid more attention in physics!

Are my Samsung INR 18650-29E SDI 2E72 batteries safe to use in a Snow Wolf TC 75W? Probably for use with Kanger Subtank mini
Spec below, but please note they are iNr rather than iMr
Normal use?
Sub Ohm use?
Or are they simply not high enough discharge for Snow Wolf?

Thanks for looking


Official specifications:

• Nominal Capacity: 2,850mAh (0.2C, 2.50V discharge)
• Typical Capacity: 2,850mAh (0.2C, 2.50V discharge)
• Minimum Capacity: 2,750mAh (0.2C, 2.50V discharge)
• Charging Voltage: 4.20 ± 0.05 V
• Nominal Voltage: 3.65V (0.2C discharge)
• Charging Method: CC-CV (constant voltage with limited current)
• Charging Current: Standard charge: 1,375mA
• Charging Time: Standard charge: 3hours
• Max. Charge Current: 2750mA (not for cyclelife)
• Max. Discharge Current: 2,750mAh (continuous discharge), 8250mAh (not for continuous discharge)
• Discharge Cut-off Voltage: 2.50V
• Cell Weight (max. (g): 48g
• Cell Dimension: Diameter(max.) : 18.40 mm, Height(max) : 65.00 mm,
• Operating Temperature: (Cell Surface Temperature) Charge: 0 to 45°C, Discharge: -20 to 60°C
• Storage Temperature: 1 year : -20~25°C, 3 months : -20~45°C. 1 month : -20~60°C

http://www.candlepowerforums.com/vb...Review-of-Samsung-INR18650-29E-2900mAh-(Blue)

AFAIK these are 8-10 amps continuous so won't be suitable for a snow Wolf or any other high powered device. Get yourself some Samsung 30q or LG hg2 batteries if you need higher capacity, both 3,000mah and rated 20-30amps. Hit up torchy (big_f_d_d) and ecolux on eBay for em

 

[paulc]

AFAIK these are 8-10 amps continuous so won't be suitable for a snow Wolf or any other high powered device. Get yourself some Samsung 30q or LG hg2 batteries if you need higher capacity, both 3,000mah and rated 20-30amps. Hit up torchy (big_f_d_d) and ecolux on eBay for em

Thanks very much, at least i know i have to buy some more now.

Great forum

 

[Beastie]

Thanks very much, at least i know i have to buy some more now.

Great forum

Out of interest where did you get the other batteries from and did you explain to the vendor what you were hoping to use them for or did you have them for other purposes?