On Sat, 03 Nov 2018 16:57:17 -0000, "Steven Watkins"
wrote:

On Sat, 03 Nov 2018 02:58:41 -0000, Rod Speed wrote:



"Steven Watkins" wrote in message
news
On Fri, 02 Nov 2018 23:56:12 -0000, Rod Speed
wrote:



"Steven Watkins" wrote in message
news On Fri, 02 Nov 2018 22:12:24 -0000, Clive Arthur
wrote:

On 02/11/2018 21:53, Steven Watkins wrote:
On Fri, 02 Nov 2018 21:34:53 -0000, Clive Arthur
wrote:

On 02/11/2018 18:40, Steven Watkins wrote:
On Fri, 02 Nov 2018 16:53:15 -0000, Clive Arthur
wrote:

On 02/11/2018 14:58, Steven Watkins wrote:

snipped

I purchased some torches with 14500s claimed to be 2400mAh which
I
didn't believe. I doubt that they were even close to 850/900mAh
as
fully
charged they didn't last long in the torch. Replacement 900mAh
batteries
lasted much longer.

I have some GTL batteries (also called GIF) (Chinese ****) that
say
2500. I tested them (bulb, ammeter) and got 500. Official tests
I've
found on websites agree. Got them free, I moaned at the seller
and
got
all the money back.

Decent makes like Efest, Sony, Sanyo are all quoted as 850 and
reviews
say you really get that. But 850 is pitiful, as NiMH gives 2700.

About the same energy, given that the lithium cells are about three
times the voltage of the NiMH.

But if you consider a Panasonic 18500, at 3Ah and 3.7V, it's twice
the
energy per volume. They just don't seem to get the higher charge
density in the smaller AA size.

ITYM "Thanks, I'd overlooked that, and 'pitiful' was clearly wrong".

No, by pitiful I meant "no better than the preceding technology".

OK, thanks. I've updated my dictionaries with that latest definition,
you silly ****[1].

[1] An intelligent and humble person (2018).

The point of LiIon was to supercede / improve on preceding technology.
In
the case of AA size it failed miserably, as it exceeded capacity by 0%.

Its not surprising that some battery technology
doesn't work as well with some physical batter configs.

So why did anyone try to make that size?

LiIon actually works much better in phones

They work well in power drills too. Much smaller and lighter battery -
which my neighbour tradesman seems to like.

And laptops.

I remember the NiCad laptops. I got an old one going that refused to boot up without the battery - the owner urgently needed files off it. I charged the battery at 3 times the correct voltage for several seconds using a high current bench supply, which broke up the crystallisation which was shorting it internally. This allowed it to charge normally in the laptop. Not sure if that would be wise with LiIon.

Although I prefer a big heavy battery so the thing stays upright when you
place it on a surface. I'd have preferred the same size and weight of
battery with a bigger capacity,

Not possible to have the same size and
weight, LiIon is very different density wise.

My 18650 LiIon batteries appear about the same weight per volume as my AA NiMH. Mind you, I think drills skipped NiMH and went straight from NiCad to LiIon - did NiMH not have enough current capability?

Nope. I've had several drills with NiMh. Like the NiCads they were
always dead when I needed them, but they did come back to life on the
charger for a few years.
Gone all Lithium now. The little 3 cell (18500?) 12 volt runs as long
as the big ugly 12 volt Nicad 9 cell? unit 3 times or more it's weight
and size - and the Lithium charged 4-8 times as fast too. I've got
the little Canadian Tie special 12 volt as well as a Bosch and a
Millwaukee. I'll never go back to non-lithium cordless tools. The
lithium is ready to go even after sittin half a year.

Same with laptops. Darn NiMh and Nicad crap was always dead when
needed. Lithiums are generally still fine 3-6 months after charging
and last 6 or more years instead of replacing NiMh adter as little as
2 years of use (many while still under warranty)

but I guess that would put the price up.

where the stupid fad is very thin phones.

As an Iphone user I thought you liked thin?

Nope, I like other stuff and would prefer
they were still as thick as say the 4S with
a much longer time between charges.

Its one thing I have always thought was stupid,
the obsession with as thin as possible.

Agreed - I know quite a few folk who moan about their Iphones not lasting as long as Samsungs. Either that or the Samsung owners laugh at them constantly charging them up.

You see it with laptops and keyboards too.

Small thin lightweight stuff is for camping, not everyday use :-)