How many mAh do I need?

[smacuser]

Yeah, I always went with more mAhs = less amps.

 

[Hawise]

It seems to be common knowledge (or rather misconception) that the higher the mAH's, the longer the battery life. I guess it comes from everyday use of AA, AAA and power tool batteries. My cordless li-ion batteries for my tools only have mAH's, and infofrom manufacturer about what brand cells they used. I never opened any of the batteries to check the CDR of the cells inside. Same with rechargable AA batteries I used before- I would check mAH's and buy the ones with highest. So yeah, I was there a few months ago until I came here anyway

True. Weird or incomplete ideas (or total befuddlement) are perfectly understandable when someone first starts looking into li-ion batteries. I was just getting a little crotchety because the message doesn't seem to be getting through in this case, although I suppose it can take a while to overcome some ingrained ideas.

@VapeyBaby: If you only look at mAh, you won't get the right battery. Li-ion batteries have an even more important specification called CDR. If you don't get the right CDR, your battery won't last long (in the best-case scenario) and may be very dangerous (in the worst).

CDR relates to how much power it can provide at a time (the wattage you're vaping at, in other words). If you get a battery with really high mAh but a lower CDR, it will struggle to provide the power you need at 80 or 90 watts. That means it will decide it's empty after a few minutes, so you won't get any benefit from all those mAh. A battery with an appropriate CDR and fewer mAh will actually last longer before you have to recharge.

 

[Frenchfry1942]

This is a website to use Ohm's Law.
Ohm's law | Steam Engine | free vaping calculators

 

[Topwater Elvis]

Jeez people,
If the OP is going to use an Innokin Plexar (a single cell power device), and is going to use a 20700 size cell ( the plexor is only compatible with 18650 with sleeve/adapter or 20700 size cells, per manufacturer), and wishes to use power settings between 80w - 90w.

There are 3 choices of the required CDR (30a) and size (20700);
Sanyo NCR2070c - 3500 mah 30a CDR
Sanyo NCR 2070A - 3100 mah 30a CDR
Molicel INR 20700A - 2800 mah 30a CDR

If the OP wants to risk buying cells that may or may not fit based on a what a 'reviewer' says;
Samsung 21700 30T 3000 mah 35a CDR
Molicel 21700 P42A 4000 mah 30a CDR
The 40T has an insufficient CDR for use above 75w. (The OP stated 80w - 90w)

When using a regulated power device coil resistance Ω does not factor in to battery amp demand calculation.
---> Calculating battery current draw for a regulated mod | E-Cigarette Forum

 

[Richard Winter]

There's a good calculator on www.vapinghardware.com, battery amp draw/drain calculator. This will work out the battery amp drain for any given mod and tell you what CDR value of battery you will need to power that device.

 

[AngeNZ]

There's a good calculator on www.vapinghardware.com, battery amp draw/drain calculator. This will work out the battery amp drain for any given mod and tell you what CDR value of battery you will need to power that device.

I absolutely loved reading your article
Calculating Current Drain | Regulated vs Unregulated
You did a fantastic job on explaining why we calculate the battery draw on a reg. mod differently to a mech/unregulated mod.

It's something I really wish every single vaper knew and understood.

 

[Richard Winter]

I absolutely loved reading your article
Calculating Current Drain | Regulated vs Unregulated
You did a fantastic job on explaining why we calculate the battery draw on a reg. mod differently to a mech/unregulated mod.

It's something I really wish every single vaper knew and understood.

Thank you very much @AngeNZ, really appreciate your comments. Glad you liked it. It's often misunderstood that the two scenarios are different.
I designed the calculators to enable people to find out the current being drawn from their batteries in regulated and unregulated setups and then wrote the guide to further explain the differences and why.

 

[Katya]

I absolutely loved reading your article
Calculating Current Drain | Regulated vs Unregulated
You did a fantastic job on explaining why we calculate the battery draw on a reg. mod differently to a mech/unregulated mod.

Thanks Ange for posting the link. I wasn't paying attention...

 

[Katya]

Thank you very much @AngeNZ, really appreciate your comments. Glad you liked it. It's often misunderstood that the two scenarios are different.
I designed the calculators to enable people to find out the current being drawn from their batteries in regulated and unregulated setups and then wrote the guide to further explain the differences and why.

Very nicely written, Richard!

I enjoyed reading it, even though I'll probably never own a mech and my favorite wattage range on a regulated mod is 12-20 watts.

 

[Richard Winter]

Very nicely written, Richard!

I enjoyed reading it, even though I'll probably never own a mech and my favorite wattage range on a regulated mod is 12-20 watts.

Thanks @Katya.
I use mechs and regulated but have to be honest I rarely go above 30+ watts. I do have the odd blast just cause I can lol. Glad you liked the post I wrote.
Thanks again.