These look interesting

[aznsx]

Vapcell buys bare sell from companies like Panasonic, Samsung, Molicel, ect,, and puts their name on them.

I'm aware of some of the base-cell manufacturers who are in the 18650/21700 segment, sizes often used to power things with motors or resistive heating elements, and often incorporated in 'battery packs' / assemblies.

I only use discrete li-ion cylindrical cells for flashlight apps, and all my Vapcells are either 16340 or 14500 cells. Does anyone know who supplies their base cells in those sizes? I don't think Panasonic, Sanyo, etc. have many offerings in those sizes.

Who supplies Vapcell with those, or are they being produced 'in-house' / on Vapcell lines?

 

[IMA SOL MAN]

I think my car battery charger has a 50A engine start/jump switch position. Perhaps the 50A cells would make up a good car jumper product.

My battery bank is beginning to worry me...all that potential BOOM! I recharge it at night about a foot from my bed... :eek:

The comments about the exploding flashlight reminds me of the Star Trek phasers that could be set to explode. Remember that?

 

[Torchy the battery boy]

Just for my own info as a non-cell-expert: Is it true that w/li-ion chemistry(ies), max capacity and max continuous output current are generally performance characteristics which fundamentally 'trade off' against each other by design, and that most cells are generally optimized for one or the other?

If true, would that mean that I should probably not select a 50A-continuous cell when my flashlight application demands a max current of, say 5A, or 10A continuous?

Pretty much. Usually high capacity means not very high current delivery and high current usually means lower capacity. For flashlights 4000mAh is the maximum available.

 

[orbital]

Pretty much. Usually high capacity means not very high current delivery and high current usually means lower capacity. For flashlights 4000mAh is the maximum available.

+

....not trying to derail your 18650 thread....
I own several Samsung 50S, they are a good balance of capacity & strong output.
Max Continuous Discharging Current: 25A/45A @ 5000mAh

21700 Samsung INR2170050S 5000mAh High Discharge Flat Top

21700 Samsung INR2170050S 5000mAh High Discharge Flat Top

illumn.com

 

[JimIslander]

Pretty sure those are rated as 50A below internal temperature of 80C. Would probably take less than a minute for the battery to reach 80C, then it will current-limit via the protection circuitry.

 

[Torchy the battery boy]

Finally got testing done and have to take my hat off to Vapcell for such an impressive battery. Even at 60A continuous current it still packs plenty of power. Never got excessively hot either - 75.4°C at 50A, other than that never reached 60°C. Totally outperforms Molicell P30B.

 

[orbital]

+

The 40A graph line is very interesting to me.
Thanks for the test, should diffuse the skeptics (y)(y)

Now , how about a 3x18650 (12V) light driving a XFL10K emitter to a good 15,000lm
not too much to ask


Acebeam,, bring back this light as above specs ^^^^^

 

[IMA SOL MAN]

I'll be honest - trying to pull 40-50 amps from a small lithium cell, even for a brief period, makes me nervous.

Yeah, me too. That is an awful lot of power to hold in your hand or have strapped to your forehead! :eek:

No thank you!

I suppose one of these days they will invent fusion powered flashlights...

 

[aznsx]

Finally got testing done and have to take my hat off to Vapcell for such an impressive battery. Even at 60A continuous current it still packs plenty of power. Never got excessively hot either - 75.4°C at 50A, other than that never reached 60°C. Totally outperforms Molicell P30B.

Torchy: What model B&K analyzer are you using? Thanx!

 

[knucklegary]

Who's your supplier for the z30 cells?

Edit: just noticed Torchy is from Scotland.
I'm not seeing that vapcell being offered, yet, from my usual suppliers here in USA