Need help, new coil, battery safety information needed

[M Salman Khan]

Hello,
I have a 3 battery regulated mod (smok Koopor Primus 300W) with TFV8 RBA section. I'm going to use 2 coils in the RBA. The resistance of one coil is 0.23 ohms so two coils will give 0.11 ohms. I'll be using 3 Samsung 25INR 20a batteries with this build.
Battery specs are below

Specifications:
Nominal Capcity: 2500 mAh
Nominal Voltage: 3.6V
Discharge End Voltage: 2.5V
Standard Charging Current: 1.25A
Charging Voltage: 4.20+-0.05V
Max. Continuous Discharging Current: 20A

Quesion:- Is this build safe to use on these batteries? And what is the maximum wattage I can use on this build?

 

[IMFire3605]

20amps X 90% Chipset Efficiency = 18amps X 9.6V lowest Battery Charge before cutoff = 172.8watts
*Volts is 3.2v lowest voltage per battery X 3 batteries = 9.6v* regulated mods pull most amps at lowest voltage

Just reversed the formula (Watts/Volts)/Mod Chipset Efficiency=Max Amps

Regulated mod, Resistance (Ohms) plays only part in the mod control chipset reading the resistance to a) determine if the resistance is in programmed operational range (generally 0.1ohm to 3.0ohm for standard wires like kanthal and nichrome, Ni200 nickel for TC most TC mods the range for Ni200 drops to about 0.05ohm), and b) use that ohm reading to adjust volts to reach set watts, after that its all in the watts and volts of a regulated mod to determine how many amps the mod pulls from the battery and the second is the amps the chip sends to the coil, the most important the amp pull from the battery.

 

[Hawise]

Welcome to ECF!

@IMFire3605 is right; you're good to 165W - 175W with those batteries. Note that battery calculations are different for regulated and mechanical mods. Mooch's blog is a great resource for battery questions and will show you how to calculate this yourself:

Calculating battery current draw for a regulated mod | E-Cigarette Forum

Any particular reason you want to go so low with your build?

 

[BrotherBob]

Hello,
I have a 3 battery regulated mod (Smok Koopor Primus 300W) with TFV8 RBA section. I'm going to use 2 coils in the RBA. The resistance of one coil is 0.23 ohms so two coils will give 0.11 ohms. I'll be using 3 Samsung 25INR 20a batteries with this build.
Quesion:- Is this build safe to use on these batteries? And what is the maximum wattage I can use on this build?

Welcome and glad you joined. Please be safe, we would hate to loose any members.
Might like to read:
All About Sub-Ohm Vaping - The Perks and the Problems
What is Sub Ohm Vaping? Our Sub Ohm Vaping Guide & Tips
Battery safety
Care and Use of 510, eGo and Variable Voltage Batteries
ECF Sub-Ohm Advisory