Big fat Li-ion, big fat price, got a 200W bulb?

[VidPro]

http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=4058

just in case you didnt see it, i thought it was interesting.
and germany too

 

[mdocod]

repeat after me:
B
O
M
B

 

[Fallingwater]

Holy monkey! Me want! ::drools::

$520? Whoa... I'll pass.

Hmm. Using 24 2.5ah 18650 cells in a parallel-wired pack would give you the same thing for about $120... Let's say $150 for a few more cells to make up for the inflated numbers.

 

[rhuck60]

repeat after me:
B
O
M
B

No doubt. What if that monster is unprotected?

I would like to see a protected cell about 2/3rd's that size for about $200

 

[DM51]

repeat after me:
B
O
M
B

L
O
L
!!

The specs are quite interesting.

Replacing that every 3 years would make a large hole in your wallet, but failing to replace it might make an even larger hole in the ground, where your house used to be.

 

[KevinL]

For that big a Li-ion, I'd rather have a whole battery of A123 cells.

And people place WAY too much faith in protection circuts, which CAN fail, and with that much current, if something fails, protected or not, it could STILL go kaboom spectacularly.

Inherently-safe chemistries are the way forward, or so I feel.

 

[lctorana]

It's more or less a No.6-sized Lithium, isn't it?

Can't think of a use for it for trying. Traction battery perhaps?

The risks make it just too scary.

 

[65535]

Electrical cars maybe, but I personally opt for an array of balanced cells in the range of 18650's maybe even lithium polymer cells, problem cells are cheap and easy to replace.

Biggest issue as I see it a 1 hour charger needs to pump 60 amps at 3.7 volts, not that much wattage, but thats large current, transformer would be bulky and the overall output is no better than parallel smaller cells, which can be charged in series at higher voltage lower current and used in parallel.

 

[Closet_Flashaholic]

Electric/hybrid vehicle hobbyists might be interested in these. It seems they might be more appropriate for something like that than flashlights. And based on the quantity discounts shown, I think they are planning on multiple purchases per user.

Of course, I wouldn't want to be in a car sitting on top of 10-20 of these things and have a problem with them going

I wonder if eventually electric/hybrid vehicles will need fire suppression systems in them.

 

[Fallingwater]

Of course, I wouldn't want to be in a car sitting on top of 10-20 of these things and have a problem with them going

Yeah, and what luck that you don't have a tank with several dozen litres of highly volatile, extremely flammable liquid down there.
Oh, wait...

 

[65535]

Thing about lithium cells is that they are much more easily set off, a short circuit well ignite them, gasoline requires an external ignition source, those cells don't.

 

[DM51]

The risks make it just too scary.

Although its price is pretty scary, I really don't think people should be too scared by the cell itself. If you look at its specifications, you will see that they are more tolerant than might be expected.

Treat it properly, and it will give you no trouble at all. Remember, problems with Li-Ions arise because the cells are of poor quality, or have been pushed too hard or otherwise ill-treated.

Those CPFers who have done their homework on the do's and don'ts of using Li-Ions do not worry about danger to themselves – but what worries them a LOT is the fact that there are so many other users have NOT done their homework, and simply do NOT understand how these cells need to be treated.

I would be the first to agree that only those who are conversant with the proper care and use of Li-Ion cells should consider using a large cell like this one.

I think it would actually be quite difficult, and/or or entail EXTREME NEGLIGENCE, to damage this large cell to an extent where it might cause a problem. In the unlikley event of this happening, it could obviously then turn into a very large and unpleasant firework.

I posted this (below) in another thread a few weeks ago:


If you:
· Buy good quality protected Li-Ion cells
· Use a good quality charger
· Don't charge them at >1C

· Don't charge them to >4.2V
· Attend to the charge, watching out for any sign of overheating
· Don't discharge them at >2C (runtime should be >30 mins)
· Don't discharge them to <3.5V resting (or <3.0V under load)
· Make sure they are balanced with other cells when used in multi-cell applications
· Inspect them regularly for any sign of damage, dents, discoloration etc
· Recycle them when they can no longer hold ~80% of charge (4.0V)
Then you will not have a problem with them.​

I think those guidelines are just as valid for this large Li-Ion cell as they are for smaller ones.

 

[LEDite]

I agree with DM51.

I've worked with 500 or so name-brand #18650 cells and never had one even vent. Some of them are over 5 years old.

In the same period of time I've seen two lead acid batteries blown apart by internal arcing on vehicles.

There is always some risk in ANY energy storage device.

Understand the limitations of the device you are working with.

Larry

 

[Aircraft800]

Need to drop one into a modified M@g host like FM's Elephant!!

200W Light Saber!!

Charge safely:tinfoil: