Am I understanding this battery thing right?

[frizzy_tyger]

Today I purchased the istick Pico. I have been reading the battery 101 for the past few days as long as a few other sources. I think I understand, but I'm not sure enough to trust my judgement on it.

The Pico calls for
Cell type: High-rate 18650 cell
Cell typeContinuous discharge current should be above 25A)
This is from the eleaf website.

I was looking at the SONY US18650VTC4 2100MAH at rtd vapor. It says it has a continuous discharge of 30A but the testing done by mooch here rates it at 23A.

Running the numbers through the steam engine calculator one would hit 18.4 amps (20% lower than 23A) at the max wattage of 75 at .22 ohms. I honestly don't see myself hitting the max wattage or going as low as .22 ohms.

It seems to me the VCT4 would be safe, but am I missing something? Do I need to find a higher rated battery? Am I just over thinking this?

 

[edyle]

Today I purchased the iStick Pico. I have been reading the battery 101 for the past few days as long as a few other sources. I think I understand, but I'm not sure enough to trust my judgement on it.

The Pico calls for
Cell type: High-rate 18650 cell
Cell typeContinuous discharge current should be above 25A)
This is from the eleaf website.

I was looking at the SONY US18650VTC4 2100MAH at rtd vapor. It says it has a continuous discharge of 30A but the testing done by mooch here rates it at 23A.

Running the numbers through the steam engine calculator one would hit 18.4 amps (20% lower than 23A) at the max wattage of 75 at .22 ohms. I honestly don't see myself hitting the max wattage or going as low as .22 ohms.

It seems to me the VCT4 would be safe, but am I missing something? Do I need to find a higher rated battery? Am I just over thinking this?

"It seems to me the VCT4 would be safe,
but am I missing something?
Do I need to find a higher rated battery?
Am I just over thinking this?"

Yes
Maybe: if you need more power, use more batteries.
No
maybe; but lithium batteries are worth a second thought at least.

 

[KenD]

Today I purchased the iStick Pico. I have been reading the battery 101 for the past few days as long as a few other sources. I think I understand, but I'm not sure enough to trust my judgement on it.

The Pico calls for
Cell type: High-rate 18650 cell
Cell typeContinuous discharge current should be above 25A)
This is from the eleaf website.

I was looking at the SONY US18650VTC4 2100MAH at rtd vapor. It says it has a continuous discharge of 30A but the testing done by mooch here rates it at 23A.

Running the numbers through the steam engine calculator one would hit 18.4 amps (20% lower than 23A) at the max wattage of 75 at .22 ohms. I honestly don't see myself hitting the max wattage or going as low as .22 ohms.

It seems to me the VCT4 would be safe, but am I missing something? Do I need to find a higher rated battery? Am I just over thinking this?

I think you may be looking at the wrong numbers in steam-engine. You need to choose "regulated" and "variable wattage" and look at amps at the battery. You'll notice that the resistance doesn't factor into the amp draw in that case. The forumla is:

Watts (+10% to account for device inefficiency) / battery cutoff voltage (as the amp draw is highest at that point, on a regulated device) = amps

So, for the Pico:
83 (75w +10%) / 3.2v = 26 amps

The vtc4 can handle that current so you're safe to use it. I use 20 amp batteries as I don't go over 50w on single-battery devices.

Sent from my M7_PLUS using Tapatalk

 

[Joshatdot]

I use 20 amp batteries as I don't go over 50w on single-battery devices.

Same here, I use LG HG2s & Samsung 25R5s in my iPV D3. I build ~0.35 ohms, and vape between 38w - 49w (I usually stay around 43.5w).

 

[zoiDman]

...

Watts (+10% to account for device inefficiency) / battery cutoff voltage (as the amp draw is highest at that point, on a regulated device) = amps

So, for the Pico:
83 (75w +10%) / 3.2v = 26 amps

The vtc4 can handle that current so you're safe to use it. I use 20 amp batteries as I don't go over 50w on single-battery devices.

Sent from my M7_PLUS using Tapatalk

-Edited-

Using a Lower Cut-off is a Good Call in that it gives you a Maximum Amp draw as you mentioned.

 

[KenD]

I think the Pico has a Higher battery cut-off than 3.2v. I believe it is 3.6v

But using a Lower Cut-off is a Good Call in that it gives you a Maximum Amp draw as you mentioned.

Djlsb (Daniel) got around 3.15v when he tested it. Around 20:10 in the video.



Sent from my M7_PLUS using Tapatalk

 

[zoiDman]

Djlsb (Daniel) got around 3.15v when he tested it. Around 20:10 in the video.



Sent from my M7_PLUS using Tapatalk

Gotcha... I stand Corrected.

 

[frizzy_tyger]

After looking back at the steam engine calculators and finding the right one it makes a lot more sense and more in line with what I had been reading.

So I feel better about ordering batteries now. Thanks everyone!