And for how long?
will it provide at least 2V @ 50A ??
for car, you will need 6-10 parallel since starter motor draw around 300A
theoretically : 2500mAH / 50A (50000mA) = 0.05 Hours = 3 minutes :bigsmile:
I like to see 10x XML flashlight with single such 26650 battery. 5 minutes runtime 
hey, if i had a light that would draw 50a, i would be happy if a 26650 would run it for 3 mins lol
After someone invented a LED which has 1V forward voltage.
Double post
Double post
WHAT, 300A!!!
Yes... why do you think cars have battery cables as thick as your thumb?
That's why supermegaultra-capacitors are much better suited to replacing cranking batteries than lithium-anything. Very high peak current for a few seconds, then the whole time after that it only acts as a sort of buffer for the alternator, which due to the internal regulator runs all the electricals directly, but can't respond instantly, at least not as fast as you can switch on the headlights or the A/C.
The only automotive system I'm aware of that can't be fully supplied directly by the alternator are some electric power steering systems that can draw a peak of 150A. With a typical 60-80A alternator the battery is actually used in those situations, and the alternator tops things up later.
there goes my idea to recycle bin… :Sp
D-cell size, qty 8 (enough for one car battery replacement): http://www.ebay.com/itm/300902910545
Massive 2600 farad, singles: http://www.ebay.com/itm/370846120905
Already built unit: http://www.ebay.com/itm/300900579759
Those are teeny weenie pansy batteries. Try this:
Do not forget…the up to 50A is just a discharge RATE capability, it’s not battery capacity. Automotive batteries have normally at least 70A (not 2.6A) of battery capacity to drive the starter.
Looks like a Kryptonite Battery. The specs look okay to me though.
sometime ago I try to start motorcycle from 4 series unprotected (salvaged from laptop) 18650 batteries. no success. Batteries got heated quickly. It may be too dangerous to use li-ion for such purpose.
Supercaps are good move to Automotive use
Yeah, I give up on this idea, if it was small-er gasoline engine maybe I would try but with 2,7l diesel, don’t want to cause meltdown 
Diesel, eh? http://www.youtube.com/watch?v=HPYYrexIEb0
saw that video couple days ago, those are caps again, I just thought it would be nice to try out something with batteries that I already have and not spend 200-300 bucks on a experiment.
I really have to get myself Accucel-6 and test this laptop pulls I have and decide what to do with them…
You can do it with lithiums, but you'll need a series+parallel config, a single series string won't have the amperage. And then figure out how to charge it (and keep the cells balanced in use) safely. Both those are issues you don't have to deal with when using capacitors.
A single series string of capacitors can still do way more amperage than needed, you only need enough of them to get their total voltage higher than the max output capable from the alternator. Even 'undercharged' they have more amperage than needed. 6 in series, 2.5v each, 15v total, if the alternator's max output is 14.6v, that's all you need to do. If it's higher than 15v, just add one more capacitor.