why i stack batterys ===6 volts

[the mechanic]

i stack batterys ----i hit the firing pin for 2-3 seconds per draw. When using a 18650 i need to hold firing pin for 5-8 sec. to get the same hit. I'm stacking 2 18350 = 6 volts in a reo grand been vaping this way for a long time, at least
1 1/2 to 2 years. Topper =rm2 at 1.0 omhs the rm2 is about a year old. Am i doing anything wrong.This was also posted in the reo forum waiting for replys

 

[Ryedan]

i stack batterys ----i hit the firing pin for 2-3 seconds per draw. When using a 18650 i need to hold firing pin for 5-8 sec. to get the same hit. I'm stacking 2 18350 = 6 volts in a reo grand been vaping this way for a long time, at least
1 1/2 to 2 years. Topper =rm2 at 1.0 omhs the rm2 is about a year old. Am i doing anything wrong.This was also posted in the reo forum waiting for replys

What make and model of batteries are you using?

 

[EBates]

Do you 18650 batteries get hot when firing 5-8 sec?
My first suspicion would be that you coil is wound with too large (gauge) wire. Larger gauges tend to heat up more slowly.
The second suspicion would be battery old or too weak or your RM internal resistance is high and needs a good cleaning

 

[tj99959]

Two stacked 18350s is 8.4v, not 6v. Now re-do your math, and the max continuous amp draw of your 18350s is what?????
Remember; only the voltage doubles when you stack batteries. The amperage rating does not, but the amperage being used sure does. In your case (one ohm) the math is simple, the amps will be the same as the voltage.
So even with the very best 18350s, you are 2.4 amps above the safe limit.
2.4 amps wouldn't be much past the limit if you were using a 20 amp battery (2%), but it's a hell of a lot when you are only using a 6 amp battery (40%)

 

[the mechanic]

What make and model of batteries are you using?

Rechargeable LiFePO4 RCR123A 3.0V 750mAhBattery
Life cycle: up to 1000 cycles
100% Compatible with Disposable CR123A Batteries
Working Voltage:3.2V and Peak Voltage: 3.6V
Charging cut-off voltage: 3.6V
Discharge cut-off voltage: 2.2V
Please never overdischarge battery below 2.2V/cell
Charge the this battery with LiFePO4 RCR123A smart charger (Package include).
Capacity:
Nominal: 450mAh
Maximum:750 mAh
Maximum discharging rate:< 550 mA
Maximum charge current: <550 mA
Cell's dimension: 17mm Dia. x 34.5mm H.
Weight: 0.6 oz (18 grams).
NOT COMPATIBLE WITH SUREFIRE FLASHLIGHT. DON'T USE THESE BATTERIES WITH ANY SUREFIRE FLASHLIGHTS.

 

[the mechanic]

Do you 18650 batteries get hot when firing 5-8 sec?
My first suspicion would be that you coil is wound with too large (gauge) wire. Larger gauges tend to heat up more slowly.
The second suspicion would be battery old or too weak or your RM internal resistance is high and needs a good cleaning

these are the batts i use .am i ok please reply
Rechargeable LiFePO4 RCR123A 3.0V 750mAhBattery
Life cycle: up to 1000 cycles
100% Compatible with Disposable CR123A Batteries
Working Voltage:3.2V and Peak Voltage: 3.6V
Charging cut-off voltage: 3.6V
Discharge cut-off voltage: 2.2V
Please never overdischarge battery below 2.2V/cell
Charge the this battery with LiFePO4 RCR123A smart charger (Package include).
Capacity:
Nominal: 450mAh
Maximum:750 mAh
Maximum discharging rate:< 550 mA
Maximum charge current: <550 mA
Cell's dimension: 17mm Dia. x 34.5mm H.
Weight: 0.6 oz (18 grams).
NOT COMPATIBLE WITH SUREFIRE FLASHLIGHT. DON'T USE THESE BATTERIES WITH ANY SUREFIRE FLASHLIGHTS.
PS. i'm using 5 wraps of 28 ga. ribbon wire ==1.2 omhs with these batterys

 

[Dampmaskin]

Maximum discharging rate:< 550 mA

Seriously?

With a 1.2 ohm load and a combined voltage of 7.2V, you're drawing 7 A. If your batteries can take max 0.55A, you're more than 12 times over the maximum discharge rate.

So, are you doing anything wrong? Yes, you are. The battery practice you describe is nowhere near safe, or sane.

 

[Larry Anderson II]

these are the batts i use .am i ok please reply
Rechargeable LiFePO4 RCR123A 3.0V 750mAhBattery
Life cycle: up to 1000 cycles
100% Compatible with Disposable CR123A Batteries
Working Voltage:3.2V and Peak Voltage: 3.6V
Charging cut-off voltage: 3.6V
Discharge cut-off voltage: 2.2V
Please never overdischarge battery below 2.2V/cell
Charge the this battery with LiFePO4 RCR123A smart charger (Package include).
Capacity:
Nominal: 450mAh
Maximum:750 mAh
Maximum discharging rate:< 550 mA
Maximum charge current: <550 mA
Cell's dimension: 17mm Dia. x 34.5mm H.
Weight: 0.6 oz (18 grams).
NOT COMPATIBLE WITH SUREFIRE FLASHLIGHT. DON'T USE THESE BATTERIES WITH ANY SUREFIRE FLASHLIGHTS.
PS. i'm using 5 wraps of 28 ga. ribbon wire ==1.2 omhs with these batterys

 

[EBates]

Since your 18350 are really RCR123's, what are you using for an 18650?

I can't make a comment on your coil I've never successfully done a build using ribbon. I've tried, but no luck.

 

[readeuler]

Since your 18350 are really RCR123's, what are you using for an 18650?

Yes, do share!

 

[Ryedan]

Rechargeable LiFePO4 RCR123A 3.0V 750mAhBattery
Life cycle: up to 1000 cycles
100% Compatible with Disposable CR123A Batteries
Working Voltage:3.2V and Peak Voltage: 3.6V
Charging cut-off voltage: 3.6V
Discharge cut-off voltage: 2.2V
Please never overdischarge battery below 2.2V/cell
Charge the this battery with LiFePO4 RCR123A smart charger (Package include).
Capacity:
Nominal: 450mAh
Maximum:750 mAh
Maximum discharging rate:< 550 mA
Maximum charge current: <550 mA
Cell's dimension: 17mm Dia. x 34.5mm H.
Weight: 0.6 oz (18 grams).
NOT COMPATIBLE WITH SUREFIRE FLASHLIGHT. DON'T USE THESE BATTERIES WITH ANY SUREFIRE FLASHLIGHTS.

OK, the good thing is LiFePO4 is a very safe chemistry. The bad part is at 1.0 ohms and 7.2 volts with freshly charged batteries you're drawing 7.2 amps from batteries that are rated for 0.55 amps. You didn't give us the battery manufacturer so I can't double check the 0.55A max rating. I think that's on the low side for a LiFePO4 RCR123A, but I doubt it's going to be anywhere near 7A.

So, that setup is pulling 52 watts of power from the batteries. You didn't say which 18650 batt you have, but a $8 Samsung 25R is rated at 20A and puts out 4.2V off the charger. With a 0.34 ohm build it draws 12.4A and makes the same 52 watts so your vape will be very similar and is very easy on the 18650 battery.

ETA: I also posted this in the Reos Mods thread.

 

[supertrunker]

I'd get a rebuild kit for the Grand, the new contacts are the business. Less cleaning and hassle and you can use the power more efficiently. Which means you're wasting your time stacking batteries and quite likely unsafe.

You use one battery, don't have to make sure both your existing ones are matched and charge to the same level (if you do that anyway). It fits on the same Grand you're using. All you have to do is make a lower resistance coil.

1000 cycles and 2 years sounds about right for ditching those and getting decent 18650s anyway.

T

 

[brickfollett]

Yeah it doesn't make sense to stack batteries and take a risk when you can just build a lower ohm build. I vape a .37 ohms with an 18650, using 26 gauge kanthal around a 2.5mm bit. It lights up pretty quick, and once you account for the voltage drop of the reo, it comes in around 40 watts or so. No point in double stacking and risking your face. not smart........