HobbyKing has released some of their high C rate (15 C) lipo cells in a cylindrical form factor. Their largest cell looks like a 1200 mAh (18 amp) cell in a 15580 format. Search their web site for "nanotech round". That technology in a 18650 cell would be killer...
Future of batteries?
Comments,please!
There are 18650 cells sold by AW with 1600mAh capacity capable of 15C. For a long time now (years) we had the AW IMR 1300mAh capable of 15C.
http://lygte-info.dk/review/batteries2012/AW%20IMR%2018650%201600mAh%20(Red)%20UK.html
Sanyo and others produce high "C" for a long time now in 18650 format.
In their pouch format you can get these cells with a 90C rate. I know people pulling over 1000 amps out of a 5 Ah pack without any apparent ill effects.
When these cells first came out, they were utterly fantastic. Unfortunately, their recent shipments of the NanoTech pouch cells seem to be crap... like packs croaking/puffing after just a few cycles. Supposedly they changed the secret sauce and screwed up big time. Hopefully, they will get their act together, but just about everybody I know has said "NanoTech never again"
I have LiPo batteries than can pull 50-60 amps and I think double that for short bursts.
They are for my RC car.
I built a 5000+ lumen flashlight that uses a Bridgelux array driven by 8 A123 2300 mAh LiFePO4 cells (in two groups of 4). These cells are about the size of D cells. Short circuit current is over 200 amps. 4 of them can start your car 20 times in 20 degrees below 0 weather.
My flashlight has jumper cables...
Now I am interested.Start a car? Found these at the battery recycling.Have to get a charger for them and try that.Thanks!
Lennart
Yes, those are the cells that I am using. Note that DeWalt has recently switched to building their packs out of 1100 mAh Samsung 18650 cells. Not nearly as cool as the A123 cells.
A guy gave me the cells that I used to test my spot welder on (http://endless-sphere.com/forums/viewtopic.php?p=280216#p280216) They were all a 0V... totally dead, worthless, trash... On a whim, I tried charging them. Out of 24 cells, 16 were perfectly good, 4 had a high self-discharge (dead again in a week), and 4 were actually dead. One of the dead ones got really hot for several hours after I tried to charge it.
Those LiFePO4 cells have a VERY flat discharge curve and work really well for direct drive applications. Over three fourths of their discharge is from 3.2 to 3.1V
For the serious battery fiend you can get a 20 Ah A123 pouch cell. In quantity for under $18 ($24 or so shipped from China). Onesies are around $32 on Ebay. I used them (dual 16S packs) in my 180,000 lumen "flashlight"
Any chance of a picture of your 180,00 lumen flashlight?
Unfortunately, the people that paid for them to be developed want to keep it in the dark so to speak for now. It is built around a modular, expandable array of 15,000 lumen blocks using a Bridgelux array driven at 5 amps. The unit is very fault tolerant with a dual redundant failsafe power system. We are putting the finishing touches on a 540,000 lumen one.
You can see parts of it's 5000 lumen baby brother at: https://budgetlightforum.com/t/-/744?page=5#comment-35263
Is it going to be for sale in the future? :)
Probably not in its present form (40 pounds of batteries make for a poor user experience). Some form of the 15,000 lumen modules may be forthcoming.