Thanks Rocketman, 18650's okay. That's why I'm going to use the switching regulator I bought. It has an efficiency rating of 94%
- Status
I'm using protected 18650's now Rocketman. I heard that AW's are better because of their "C" ratings. But I opted for Trustfire 2400mah because of the price.
I know the "experts" swear by the AWs but I use the TF 2400 protected and don't have any problems. Just as long as you don't get any made by Johnson and Johnson. They put wood and metal chips in stuff they make 
Just wanted to make sure about the "protected" aspect.
Since the AWs are three times as good as the TFs it sort of comes out even price wise
Just wanted to make sure about the "protected" aspect.
Since the AWs are three times as good as the TFs it sort of comes out even price wise
Well you should always opt for two 3.7V cells, there is the drop out voltage of the regs to consider. The linears are best at 0.5V, the switching type are at about 1.3V. What that means is for a 5V vape you need 6.3V+ from your cells.
A tube large enough for the reg plus a pair of 18650's seems too long, cumbersome, and heavy to me.
A tube large enough for the reg plus a pair of 18650's seems too long, cumbersome, and heavy to me.
Could parallel the pipes, series the cells. I've seem mods with a pair of 18650s.
'course if it was me, I'd just parallel the cells for a longer 3.7 volt vape
'course if it was me, I'd just parallel the cells for a longer 3.7 volt vape
Yes Willy, It would be quite long. I'd have to take my shoes & socks off to hold it from the bottom. LOL. No seriously, it's not something I could take out doors. so.... CR123's would fit in place of 1 18650 and would be more practical in size.
Also the regulator I bought was: http://focus.ti.com/lit/ds/symlink/ptr08100w.pdf it's up to 96% efficient.
I see it in the Evercool by bigblue30 at: http://www.e-cigarette-forum.com/forum/battery-mods/114901-evercool-variable-voltage-mod.html
Last edited:
Where do you find linear regs with a .5 dropout that are rated high in amps and also have a max input higher then 8.4 volts. I cant seem to find any without pushing the chip passed it's max rating. A 10 amp would be nice but at this point i would settle for a 3 amp
Have you read the datasheets for TI's UCC283/383 family? They have fixed and adjustable versions.
Features
* Precision Positive Linear Series Pass Voltage Regulation
* 0.45 V Dropout at 3 A
* 50 mV Dropout at 10 mA
* Quiescent Current Under 650 µA Irrespective of Load
* Adjustable (5-Lead) Output Voltage Version
* Fixed (3-Lead) Versions for 3.3-V and 5-V Outputs
* Logic Shutdown Capability
* Short-Circuit Power Limit of (3% × VIN × ISHORT)
* Low VOUT to VIN Reverse Leakage
* Thermal Shutdown
Features
* Precision Positive Linear Series Pass Voltage Regulation
* 0.45 V Dropout at 3 A
* 50 mV Dropout at 10 mA
* Quiescent Current Under 650 µA Irrespective of Load
* Adjustable (5-Lead) Output Voltage Version
* Fixed (3-Lead) Versions for 3.3-V and 5-V Outputs
* Logic Shutdown Capability
* Short-Circuit Power Limit of (3% × VIN × ISHORT)
* Low VOUT to VIN Reverse Leakage
* Thermal Shutdown
WillyB, How about using 3.7volt or 3.6volt CR123a's also known as 16340?
I found these CR123a 3.6v, 880mah batteries at: Ultrafire 3.6V 880mah Protected Li-Ion Rechargeable Battery RCR123A CR123A 16340 CR16340
and 3.7v AW's at: AW RCR123a Protected 750 mAh Battery
Two would fit (68mm long) in place of one 18650 which is 65mm long. Plus I can use the same charger as the 18650.
What do you think Willy?
Well you'll need some actual measurements, most 18650's are about 67+mm long.
These are ruler measurements (close but not perfect and often there are sample to sample differences) but a pair of these are about 5mm longer (~72mm) than my TrustFire 2400mAh flame (68mm).
TrustFire Protected 3.6V 880mAh 16340 Lithium Battery (2-pack)
These are very hard to find protected except at MadVapes, but at 1200mAh would be a nice choice if you are stating from scratch, but a pair of these is about ~75mm.
Protected 18350 Lithium Ion Battery
The AW LiMN's (high drain) are usually shorter than the Li-Ions (no bottom protection circuit), but they don't make an 18350.
Hey WillyB,
What are the highest mah's for the 18350? I've been searching and only come up with the MV's 1200mah. Also the MV 18350 says:
"Pictures are approximate. Battery labels and colors may vary slightly at times depending on the manufacturer but always high quality, protected and the rated mAH."
Should I be concerned?
I've gotten 2 from there at quite different times (2-3 months?) and both were blue ultrafire 1200mah. I wouldn't worry.
Okay asdaq, you convinced me.... Made the purchase last night... (4) 18350's 1200mah, 3.7v plus more battery connectors and more switches. I should have bought some stock in MV.
Although my end caps work good, I cut them down even smaller. I spend today cutting and fitting the parts and wired up the regulator. Tested the circuitry outside the tube and I can vary the voltage (no load) from 3.5v to 8.65 (fully charged).
I'll probably get reamed for this.
If your output voltage on this unit is over 5.5volts. What you are reading is battery voltage and not regulated voltage. Sometimes due to bad wiring usually the ground circut. But then again I vape a lot of Geritol.
WillyB, I have a 220 ohm resister in series with a 200 ohm pot making a total of 420 ohms. If you look at Table 2. "Calculated Rset Reister Values", 0.421k will give you 3.4 volts.
Okay that takes care of the 3.4 volts, got to check the wiring make sure I'm not zero-ing out the resistance causing the 8.65volts. 220 ohm resister was reading about 190 ohms which would give me more than 5.5 volts but not the full battery voltage.
Update:
Found the 8.65v problem: See post #44
Okay that takes care of the 3.4 volts, got to check the wiring make sure I'm not zero-ing out the resistance causing the 8.65volts. 220 ohm resister was reading about 190 ohms which would give me more than 5.5 volts but not the full battery voltage.
Update:
Found the 8.65v problem: See post #44
Last edited:
Although my end caps work good, I cut them down even smaller. I spend today cutting and fitting the parts and wired up the regulator. Tested the circuitry outside the tube and I can vary the voltage (no load) from 3.5v to 8.65 (fully charged).
I'll probably get reamed for this.
Roadrash, not sure what you are saying? Can you elaborate?
- Status
Similar threads
