Don't know. It's been too long since I dug into hand tools much. I remember having an RC boat which ran ok on alkaline cells. Then I got rechargeables for it and it TOOK OFF like a rocket. Seems the lower resistance of the NiCd made a big difference. But it only ran for five minutes, lol.
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LiPo is higher capacity and higher discharge rate, and NiCD is pretty much banned in the EU
Most stuff designed for Alkalines ran like crap with NiCds, due to the lower voltage. Some stuff didn't run at all (UVLO). NiCds also have a horrible self discharge and short life, particularly multi-cell packs if not kept charged. A real bad combination for tools. LiIon fixes all that.
cobblers.
Self discharge for sure. But I don't know about the short life. I have a Makita power tool with NiCd batteries and that thing ran for 15 years before the battery wouldn't charge. It was often left laying around uncharged so it wasn't pampered either. I was amazed. A new battery pack costs as much as a new tool with Li-ion. Actually, I think the tool I replaced it with
*also* used NiCd, to my surprise and it crapped out after a much shorter time. Finally I got a hammer drill with Li-ion and all is good.
and some runs better due to more current delivery
nonsense. NiMH did, NiCd went months before discharge.
I finally threw my early 80s nicads out a few years ago. 450mAh AAs or some such Like anything you could also buy junk.
Not really. NiCd were vulnerable to damage from overdischarge.
my sub-C NiCd tools work great.
Li-ion is way fussier about treatment.
NT
You bet! A LiIon will still be good after five years sitting on a shelf. Try that with a NiCd. You're lucky if you get one. I never have, even with "high quality" rebuits.
That was true with NiCd, too. Cost price.
Wrong. 20-50% a month wasn't unusual.
Not junk. None of my DeWalt, RotoZip, or Makita NiCd tools had a useful life of more than a couple of years. I was always buying new batteries for the Makita and I had the RotoZip batteries rebuilt a couple of times (originals no longer available). All are junk, now.
And self-discharge.
Mine are all dead. Every one (quite a number of them). OTOH, the LiIons are all still going great. I did lose one 10.8V Bosch very early but the other dozen 10.8V and 18V batteries are still going great after 8 years, often stored discharged for a year.
Disagree. They can be put on the shelf for a year and still work fine.
As I said I only junked my early 80s NiCds a few years ago. Unlike you I use NiCds day in day out hence I know you're exaggerating their issues so much as to be unrealistic
NT
Self-discharge *IS* the problem with NiCds.
Toxicity and low capacity are NiCd's main problems. NiCd has much less self discharge than NiMH.
NT
On a sunny day (Sat, 21 Oct 2017 16:29:07 -0700 (PDT)) it happened snipped-for-privacy@gmail.com wrote in :
There was a problem with 'memory effect' with nicads. I still have one Panasonic AA nicad, lemme see it measures 0 V exactly, has not been used since...1984?? I will try to charge it an see what happens, it is suficiently discharged now to not have to bother about memory effect. If it does not come alive I will toss it, more later. It was in the box with 2 other useless AA cells, the Duracell 2500mAh Nimh that self discharges in 24 hours...
On a sunny day (Sun, 22 Oct 2017 08:19:04 GMT) it happened Jan Panteltje wrote in :
Charged it to 1.6V at .5 C. Works again, low Ri too (short circuit test gives huge current limited by multimeter test leads). So back in the box. Panasonic makes nice batteries.
which was hugely overstated in order to sound expert and sell pointless gadgets. The average user was not going to run into it. No tech is issue-free, but this thread has been quite unrealistic about NiCds.
NT
0.5C is way too high btw, 0.1C for 16 hours was standard.
NT
On a sunny day (Sun, 22 Oct 2017 06:24:54 -0700 (PDT)) it happened snipped-for-privacy@gmail.com wrote in :
You are quite right, it sais on the 500 mAh AA, charge for 15 h at 50 mA. So I charged it for about 2 hours at 250 mA :-) (impatient). Not going to use it anyways, cadmium is dangerous... That said, in 1968 or so we had in the company a 48 V don't know many Ah case of 2 meters by half a meter or so NiCad bank, half a meter hight, for railway equipment test, and battery charger (huge thyristor controlled chargers) tests. and I am still alive. I may test that Panasonic nicad in a week or so to see how self-discharge happens.
But again, use lifepo4 for safety if you can. Also note the 500 mAh nicad AA versus what we have now Eneloop NiMh 1.8 mAh AA with zero self-discharge. I have a bunch of those in use. Next in line upwards is lipo, reliable, low self-discharge, high capacity, Then there is liion but .. I did some tests with 2 liion cells in series in my drone, lipo beats it in flying time. Those were the best liions I could find, Sony, then I tested with 3 liions in series and a buck regulator, drone could not lift it. Liions are heavier than lipos?
The other thing is it seems to be no problem to charge lipos at 1 C or maybe more.
Sure but self-discharge doesn't kill NiMH cells. They rather like being stored that way.
ditto for NiCds. You ought to know your subject before arguing
NT
LOL!
Alkalines have lower voltage. 0.9V terminal discharge voltage vs 1.15V
Stuff that quits at 1.2V was not designed, or perhaps was designed to sell batteries.
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