Dual Cell LiPo Batteries compared to regulated dual 18650 setups

[battouter]

I was looking at the Tesla Nano 60w TC and was wondering about how those lipo batteries work. It says that it has a internal 3600mAh Dual CellLiPo Battery (max ouput voltage is 8v and max put current is 24.5A)

My question is, does this dual lipo setup have more Wh than a dual 18650 setup? TIA!

 

[K_Tech]

The calculation for watt hours is simply mAh x nominal voltage.
Nominal voltage for a two-cell Lipo is 7.2 volts, so that's 25.9 watt-hours.
A dual series 18650 setup has a nominal voltage of 7.4 volts, so it would depend on the capacity of the batteries used.
Keep in mind that you're not going to find a high capacity 18650 with a very high current rating. For the sake of calculation let's use the 20 amp AW IMR with a capacity of 3000 mAh. That will give you 22.2 watt-hours. And that's the best you'r going to get, all the other high CDR batteries (20 amp or greater) are going to have a lower capacity, typically 2600 mAh or less.
There is an Efest that claims a 20 amp CDR and a capacity of 3100 mAh, but given their history, I wouldn't fully trust it.

 

[battouter]

Hmmm, so why aren't lipo's popular? it is because it's more unstable and dangerous?

 

[suprtrkr]

Hmmm, so why aren't lipo's popular? it is because it's more unstable and dangerous?

Exactly. That, plus it's a lot easier to change an 18650 than a LiPo pack.

 

[Completely Average]

And the price difference. An LG HG2 costs $6 per battery. $12 for a pair. The Lipo that the Tesla uses costs more than $20.

 

[Scy123]

I doubt the Tesla Nano 60w TC has anywhere close to 25.9wh. most dna200 boxes have 10-15wh and they are regular sized. a dual 18650 setup has about 20wh with 3000mah batteries.

Edit - I just looked it up.A Hcigar VT200 with a 1300mAh lipo battery. (about the largest you commercially see) has 14.43 Wh. The stats on the Tesla Nano are defiantly over inflated. With Dna200 mods it is hard to trick you cause they have to list the wh in the settings and you can easily look those up.

My Wismex dna200 with 3x 18650 on the other hand has 30wh. Vs the 15wh on the Hcigar VT200

 

[Baditude]

Hmmm, so why aren't lipo's popular? it is because it's more unstable and dangerous?

Exactly. That, plus it's a lot easier to change an 18650 than a LiPo pack.

And the price difference. An LG HG2 costs $6 per battery. $12 for a pair. The Lipo that the Tesla uses costs more than $20.

Agree with the above. LiPo batteries are not a safe chemistry battery, and comparatively more expensive. Also consider that most mods with internal non-removeable batteries (LiPo) are considered to be disposable once the batteries die, so over the long term mods with removeable batteries are a better investment. Instead of replacing a $30-100 mod you only have to replace a $6 battery.

Deeper Understanding of Mod Batteries Part 1

 

[The Cloud Minder]

Agree with the above. LiPo batteries are not a safe chemistry battery, and comparatively more expensive. Also consider that most mods with internal non-removeable batteries (LiPo) are considered to be disposable once the batteries die, so over the long term mods with removeable batteries are a better investment. Instead of replacing a $30-100 mod you only have to replace a $6 battery.

Listen to the man^.

He know.

A Baditude post is like Vape Gospel.

 

[speedy_r6]

The calculation for watt hours is simply mAh x nominal voltage.
Nominal voltage for a two-cell Lipo is 7.2 volts, so that's 25.9 watt-hours.
A dual series 18650 setup has a nominal voltage of 7.4 volts, so it would depend on the capacity of the batteries used.
Keep in mind that you're not going to find a high capacity 18650 with a very high current rating. For the sake of calculation let's use the 20 amp AW IMR with a capacity of 3000 mAh. That will give you 22.2 watt-hours. And that's the best you'r going to get, all the other high CDR batteries (20 amp or greater) are going to have a lower capacity, typically 2600 mAh or less.
There is an Efest that claims a 20 amp CDR and a capacity of 3100 mAh, but given their history, I wouldn't fully trust it.

a 2s series lipo is 7.4v nominal.

I wonder if they don't mean it has a dual cell in parallel configuration. That would actually make it somewhat reasonable. If they are two 1800mah lipo cells in parallel, it would technically be a dual cell, 3600mah battery pack. From there, it could just use a boost chip to boost the output voltage up to 8 volts.

From their website: "The Tesla Nano 60W TC Box Mod is powered by a 2 cell Li-Po battery rated at 3600mAh."

I am actually going to lean towards them being totally honest and it actually having two lipo cells in parallel adding up to 3600mah capacity. That would give it 13.32 watt hours. I could actually believe that as being possible.

 

[pevinsghost]

Mooch, a well known battery tester has a comparison of lipo's to 18650's.

Watt-Hour Shootout -- FullyMax 10Wh 900mAh 3S LiPo (for DNA200) vs 25R vs HG2