Battery Calculations

[magikarp]

OKAY. so here is my problem. i'm currently new to APVs, wattages, resistance and RDAs so i apologize ahead of time because i know this has already been beaten to death about this topic. Buuut, i'm in need and i need stupid terms because my own research is coming up with nothing...

I'm using AW's IMR 18650 2200Mah batteries. I'm trying to find the threshold of these batteries using Steam engines battery drain calculator. at 20 watts with a 1.0 Resistance atty it says i'm pushing slightly over 5.5A. i was told that an amp and watts go hand and hand and that i shouldn't extend over 20 watts when using this battery. is this true or have i mixed myself up completely. Should i stay in the batterys nominal voltage and not exceed 3.7 volt?

so per say i'm using 1.0 Ohm atty, what is the peek i can use this battery?

 

[PaulBHC]

A fully charged battery will be 4.2 volts. It will run down somewhat quickly to 3.9 then slower to 3.7

So you need to find out what will happen with a fully charged battery.

 

[PaulBHC]

If I change the page to unregulated, 1 ohm, 4.2 volts, with your battery, it shows 4.2 amps. Well below the capacity of that battery.

 

[magikarp]

A fully charged battery will be 4.2 volts. It will run down somewhat quickly to 3.9 then slower to 3.7

So you need to find out what will happen with a fully charged battery.

Sorry, I should have made it clear that I'm using a regulated 30watt device. but so in theory, at 1.0 resistance, 50 watts is safe to be pulled from the battery?

 

[PaulBHC]

You can't pull 50 watts if it is a 30 watt device.

Anyway, check the device specs to see if it limits the amps by itself. The chip will probably keep you from firing something if it would equal more than the limit.

 

[Spirometry]

Sorry, I should have made it clear that I'm using a regulated 30watt device. but so in theory, at 1.0 resistance, 50 watts is safe to be pulled from the battery?

With a regulated device, the atomizer resistance is taken out of the equation. The highest amp draw on a mechanical is when the battery is fully charged, on a regulated device the amp draw increases as the battery voltage goes down.

With a regulated device you need to know the wattage, the efficiency of the chip and the lowest battery voltage it will fire.
So lets just say your chip is 90% efficient. At 30 watts you will be drawing 33 watts from the battery. If your device has a 3.2 volt cut-off then you would be pulling up to 10.3 amps from the battery.

So if you have a Red AW 2200 mAH, then your well within spec. If your AW is all black, then you may be in trouble.