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Lithium Polymere batteries are really good. They have high capacities and allow high discharge currents. They are also a little dangerous. When a cell dies, things can get messy, including fire or really unhealthy smoke or contamination.
I bought four 6s (six serial cells = 22.2V) with a capacity 5000 mAh for my model helicopter, a T-Rex 550. In these five years I charged them hundreds of times and spent about 150 hours in the air. I always treated the batteries like raw eggs and up to now all cells of all batteries were always +- 0.01V of the others. I had expected a slow degradation of the capacity and an increase of divergence in the voltages of the cells, but that never happened. It was almost as if the batteries did not age at all.
I should have known that trouble was coming when I charged the batteries today. One cell in the oldest battery was 0.1 V lower than the others and it took an hour of balancing to charge it to -0.03 V relative to the other five cells. The other three batteries were as good as ever. The usual +- 0.01V, as always.
Then, while flying, that cell must have died. Quite unspectacularily actually. No fire, no poisonous smoke, just a helicopter that suddently seemed to be a little tired. After the landing I noticed that the battery was unusually warm and a small LED showed that it was discharged down to under 30% which was a little too low for only half the usual flight time.
Back home, I found that the oviously damaged cell had died. 0V. The other five cells were still at 3.9V (+- 0.01V), as good as ever. Nothing left to do than to try to discharge it, cut off the connector, tape off the wires and off we go to recycling.
I think the batteries held up very well. Three of them are still as good as ever and they already had a long life. I think they are really good quality batteries.
So what are your experiences with such batteries? What do you use them for and how do they hold up? Any burning Teslas?
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
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Why does an alıen need a spacesuıt
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To keep from being contaminated while amongst us humans!
Technician
1. A person that fixes stuff you can't.
2. One who does precision guesswork based on unreliable data provided by those of questionable knowledge.
JaxCoder.com
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"Don't drink the water and don't breathe the air." -- Tom Lehrer
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So you wrote the script for the movie with the dumbest aliens in the universe[^]?
***SPOILER*** The aliens are very 'allergic' to water. They react to it like a vampire that gets sprinkled with holy water. And they are dumb enough to run around split naked on our little planet where water frequently falls from the skies. Not that it would be a good idea for them to do that even if water was no problem for them.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
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Gremlins ? 
Patrice
“Everything should be made as simple as possible, but no simpler.” Albert Einstein
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Don't forget Alien Nation (1988) - IMDb[^] where sea water was fatal to them as well.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Right, but these guys did not choose to come here and had to make the best of it.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
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CodeWraith wrote: the dumbest aliens in the universe?
Um, War of the Worlds?
Even stupid Earth people of the time knew about bacteria and disease, but the Martians didn't?
Looks like idiocracy might the end-point of all advanced civilisations.
I wanna be a eunuchs developer! Pass me a bread knife!
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To breathe when in a vacuum?
Is this a trick question?
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More to the point: why is your keyboard using a "Turkish ı"[^] instead of a regular lower-case "i"? 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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In just over an hour it will be fifty years since a human first landed on the moon. And a wonderful thing to do, everybody involved should be very, very proud of themselves and the job they all did.
But ... in just over three short years it will be the fiftieth anniversary of the last time a human stood on another world. And none of us should be proud of that... 
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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I still have the Florida Times Union paper from that day.
It's old, badly yellowed and fragile but readable.
I found it about 10 years ago in a closet of a house I was working on, that and an old WWI poster by Christy that I've framed and have hanging in my living room.
Technician
1. A person that fixes stuff you can't.
2. One who does precision guesswork based on unreliable data provided by those of questionable knowledge.
JaxCoder.com
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OriginalGriff wrote: But ... in just over three short years it will be the fiftieth anniversary of the last time a human stood on another world. And none of us should be proud of that...
Look at it this way: The effort to do this is immense. To justify it you need, above all, a very good reason. Proving that you can do it is not enough once it has been accomplished and I'm not so sure we are ready yet to do something significantly more ambitious.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
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Well, technically it isnt a world (the number of times I heard it called a planet on radio! Dear oh god, letting plebs into the media, what a mistake. ) it is of course a moon, but, the real nasty thing are the 150 or so Nazis, some of whom actually hung slave workers, who put Americans on the moon.
Very much a mixed story of huge success, built on some of the vilest events in human history.
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Very much the story of civilization throughout all of history, I'm afraid.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Chrome, unlike Firefox, Opera and Edge, never ever loads a full tab advertising more "stuff" they want you to download and use when all you want to do is load up a page.
Insanity.
cheers
Chris Maunder
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Ummmm... what?
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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About insanity, this week I had to prepare a new builder with Windows Server 2019 and only standard IE 11 installed. Not wanting to install "unnecessary software" it took me about an hour to get the security settings right to download any software like VS2017. For every click a popup showed up that I had to "add to the secure sites filter". Do you think you can configure this in IE security settings ? Wrong, you have to go to the Windows Server manager panel !
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One annoying behavior of IE 11 is the login box of windows authentication. When the box pops out, user cannot close the browser unless credentials are entered (or fail the authentication to display error). At work, most users have three or four tabs set to open when IE 11 starts. If a user wants to close the browser, he has to enter credentials for all tabs.
TOMZ_KV
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Chris Maunder wrote: advertising more "stuff" they want you to download and use when all you want to do is load up a page.
I don't know...It's been decades now I've set up IE to load in private mode by default, so pages don't get to save anything including cookies...so whenever it loads Google's homepage, it insists pretty hard I try out Chrome. On. Every. Visit.
Which is a lot more in-your-face than a separate tab.
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When I stick to Chrome it's usually real cold and I've stuck my tongue to a bumper.
Technician
1. A person that fixes stuff you can't.
2. One who does precision guesswork based on unreliable data provided by those of questionable knowledge.
JaxCoder.com
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And *YES*, Google Chrome is probably one of the fastest web-browsers, providing more efficient credentials security and user privacy. The vast of antivirus software manufacturers such as Avast! recommend this particular web-browser, empowered with various of security and user safety add-in's such pop-up and adware blockers. Privacy browsing mode is one of the Chrome's features that I admire.  , and I hope you admire it as well.
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Thanks for the laugh! 