stacking batterys rcr123

[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

 

[Filthy-Beast]

Are you swapping the batteries from top to bottom, keeping them in sets and regularly metering them before and after use?

With the single 18650 battery did you try it with .4 ohm coil or still a 1 ohm coil?

 

[Papa_Lazarou]

Well, with stacking you double the voltage but not the max amperage. Depending on the bats used, this can mean some risk with lower ohm builds exceeding that max. Given the build specs you mention, your bats need to be rated for 4.5 amps continuous operation and many would say that you should have 20-100% headroom above that for safety, so that means you're looking at ratings of 5.5-9 amps.

There are VV reos that are designed to use stacked 350's, but the recommended coil resistance is more like 1.6-2.5 ohms. It's a little apples and oranges, given the regulation control of that model (plus, it was released prior to today's higher amp bats), but you get the idea.

 

[redeyedancer]

Two 18350s in a grand cant leave much room for the spring to drop . I would like to see a picture of this mod with the batteries in it .
I always try to talk people out of stacking batteries in a mod lowering your ohm and running a single 18650 is the safest way to go .
Sounds like you were taught this by a older school 6 volt vaper . There is no need to stack batteries anymore

 

[Ryedan]

the mechanic, in the other thread you posted this information on the 18350 batteries you're using. I wanted to post it here so more people see it and can help advise you:

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.

My comment was:

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.