Charging time for Ultrafire 18650 6800 mAh battery

On 24/11/2018 07:49, tabbypurr@gmail.com wrote:
> On Saturday, 24 November 2018 01:48:55 UTC, carlon...@gmail.com  wrote:
>> how many hours to charge a 18650?please be inform me
> 
> If it's 1Ah (1000mAh) then 1A for 1 hr, or 1/2A 2 hrs etc.
> If it's 2Ah, double that etc
> 
> 
> NT
> 
Or ages and ages with a USB driven charger...

---
This email has been checked for viruses by Avast antivirus software.
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On Fri, 23 Nov 2018 22:21:43 -0500, krw@notreal.com wrote:

>How do you know your battery is 6800mAh? Did Amazon or, even better
>yet, Alibaba tell you it was 6800mAh?

Strangely, the 18650 seems to have a peculiar property where it gets
cheaper as the capacity increases. You can get 12 Ah (12,000 mAh)
cells on Ebay for less than two bucks these days.

There are plenty of videos on Youtube showing people cutting these
cells open to reveal what is inside. In some cases, an itsy bitsy LiPo
cell and a bunch of sand.

Ebay does nothing to stop the swindlers, even after having been
notified.
-- 
RoRo

On Sat, 24 Nov 2018 16:33:57 +0100, Robert Roland <fake@ddress.no>
wrote:

>On Fri, 23 Nov 2018 22:21:43 -0500, krw@notreal.com wrote:
>
>>How do you know your battery is 6800mAh? Did Amazon or, even better
>>yet, Alibaba tell you it was 6800mAh?
>
>Strangely, the 18650 seems to have a peculiar property where it gets
>cheaper as the capacity increases. You can get 12 Ah (12,000 mAh)
>cells on Ebay for less than two bucks these days.

Wow, that's surprising.  The additional ink costs something. ;-)

>There are plenty of videos on Youtube showing people cutting these
>cells open to reveal what is inside. In some cases, an itsy bitsy LiPo
>cell and a bunch of sand.
>
>Ebay does nothing to stop the swindlers, even after having been
>notified.

Believe nothing being sold on these sites.  Batteries seem to be the
absolute worst.  It can be difficult to find honest battery suppliers.
Buying directly from the manufacturers is almost impossible, even if
your volumes are quite large (been there, haven't been able to do
that).

On Fri, 23 Nov 2018 17:48:51 -0800 (PST), carlonunez34@gmail.com
wrote:

>how many hours to charge a 18650?  please be inform me

Ultrafire 18650 batteries are junk.  Here's the discharge curve of an
allegedly 3000ma-hr Ultrafire 18650 cell at 1.3A:
<http://www.learnbydestroying.com/jeffl/LiPo/Ultrafire%20LiPo%203000%20ma-hr%2018650.jpg>
<http://www.learnbydestroying.com/jeffl/LiPo/Ultrafire%2018650%20test.jpg>
Looks like it's really only good for 800ma-hr capacity.  You would
need three or four of these cells to equal the capacity of a real
18650 cell.

For fun, I crammed the blue Ultrafire 3000 cell in the photo into a
handy flashlight and ran it until the light quit.  No runtime number
here because the battery was partly charged.  I then crammed it into a
XTAR VC2 charger and started the timer.  The charger indicated it was
charging at 500ma rate.  I missed when it actually proclaimed the
battery as being fully charged, but my guess(tm) is 70 minutes.  The
theoretical charge time at 500ma would be:
  800 ma-hr / 500 ma = 1.6 hrs

One problem with over-rated and junk batteries is reconciling the
discrepancy between the over-inflated capacity, and the real battery
capacity.  The problem is that the recommended charging rate is about
0.6C.  For the Ultrafire 18650, that would be:
   3000 * 0.6 = 1800 ma  (using advertised capacity)
or 
    800 * 0.6 = 480 ma  (using measured capacity)
If I tried charging this Ultrafire cell at 1800 ma, I would be
overcharging it at 2.3C.  Therefore, if you must buy junk batteries on
eBay, take the time to measure the capacity and use the measured value
to establish the charging rate.

For more info, I suggest you dig through:
<https://lygte-info.dk>
<https://www.candlepowerforums.com/vb/forum.php>
<http://budgetlightforum.com/forum>
<https://batteryuniversity.com/index.php/learn/article/charging_lithium_ion_batteries>

Drivel and status report:  Just escaped from the hospital.  Laser
lithotripsy to remove one kidney stone failed.  I go back in a week or
so to try again.  A month later, I repeat the ceremony to remove the
other boulder.  I'll be rather scarce in the forums and mailing lists
until I'm recovered.


-- 
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

On 11/24/18 Jeff Liebermann wrote:
>Drivel and status report:  Just escaped from the hospital.  Laser
>lithotripsy to remove one kidney stone failed.  I go back in a week or
>so to try again.  A month later, I repeat the ceremony to remove the
>other boulder.  I'll be rather scarce in the forums and mailing lists
>until I'm recovered.

Hope everything goes well from now on.

-- 
Regards,
Carl Ijames

On Saturday, 24 November 2018 19:33:51 UTC, Jeff Liebermann  wrote:
> On Fri, 23 Nov 2018 17:48:51 -0800 (PST), carlonunez34@gmail.com
> wrote:
> 
> >how many hours to charge a 18650?  please be inform me
> 
> Ultrafire 18650 batteries are junk.  Here's the discharge curve of an
> allegedly 3000ma-hr Ultrafire 18650 cell at 1.3A:
> <http://www.learnbydestroying.com/jeffl/LiPo/Ultrafire%20LiPo%203000%20ma-hr%2018650.jpg>
> <http://www.learnbydestroying.com/jeffl/LiPo/Ultrafire%2018650%20test.jpg>
> Looks like it's really only good for 800ma-hr capacity.  You would
> need three or four of these cells to equal the capacity of a real
> 18650 cell.
> 
> For fun, I crammed the blue Ultrafire 3000 cell in the photo into a
> handy flashlight and ran it until the light quit.  No runtime number
> here because the battery was partly charged.  I then crammed it into a
> XTAR VC2 charger and started the timer.  The charger indicated it was
> charging at 500ma rate.  I missed when it actually proclaimed the
> battery as being fully charged, but my guess(tm) is 70 minutes.  The
> theoretical charge time at 500ma would be:
>   800 ma-hr / 500 ma = 1.6 hrs
> 
> One problem with over-rated and junk batteries is reconciling the
> discrepancy between the over-inflated capacity, and the real battery
> capacity.  The problem is that the recommended charging rate is about
> 0.6C.  For the Ultrafire 18650, that would be:
>    3000 * 0.6 = 1800 ma  (using advertised capacity)
> or 
>     800 * 0.6 = 480 ma  (using measured capacity)
> If I tried charging this Ultrafire cell at 1800 ma, I would be
> overcharging it at 2.3C.  Therefore, if you must buy junk batteries on
> eBay, take the time to measure the capacity and use the measured value
> to establish the charging rate.
> 
> For more info, I suggest you dig through:
> <https://lygte-info.dk>
> <https://www.candlepowerforums.com/vb/forum.php>
> <http://budgetlightforum.com/forum>
> <https://batteryuniversity.com/index.php/learn/article/charging_lithium_ion_batteries>
> 
> Drivel and status report:  Just escaped from the hospital.  Laser
> lithotripsy to remove one kidney stone failed.  I go back in a week or
> so to try again.  A month later, I repeat the ceremony to remove the
> other boulder.  I'll be rather scarce in the forums and mailing lists
> until I'm recovered.

Good luck with that one :/


NT

On Sat, 24 Nov 2018 17:56:32 -0500, "Carl"
<carl.ijamesXYZ@ZYXverizon.net> wrote:

>On 11/24/18 Jeff Liebermann wrote:
>>Drivel and status report:  Just escaped from the hospital.  Laser
>>lithotripsy to remove one kidney stone failed.  I go back in a week or
>>so to try again.  A month later, I repeat the ceremony to remove the
>>other boulder.  I'll be rather scarce in the forums and mailing lists
>>until I'm recovered.
>
>Hope everything goes well from now on.


Yes, good health to you for new years !

On 24/11/2018 19:33, Jeff Liebermann wrote:

<snip>

> Drivel and status report:  Just escaped from the hospital.  Laser
> lithotripsy to remove one kidney stone failed.  I go back in a week or
> so to try again.  A month later, I repeat the ceremony to remove the
> other boulder.  I'll be rather scarce in the forums and mailing lists
> until I'm recovered.

First of all my sympathies.

Can I ask why the procedure failed first time?


-- 
Mike Perkins
Video Solutions Ltd
www.videosolutions.ltd.uk

On Mon, 26 Nov 2018 03:33:59 +0000, Mike Perkins <spam@spam.com>
wrote:

>On 24/11/2018 19:33, Jeff Liebermann wrote:
><snip>
>> Drivel and status report:  Just escaped from the hospital.  Laser
>> lithotripsy to remove one kidney stone failed.  I go back in a week or
>> so to try again.  A month later, I repeat the ceremony to remove the
>> other boulder.  I'll be rather scarce in the forums and mailing lists
>> until I'm recovered.

>First of all my sympathies.

Thanks, and also my thanks to others who also offered their
sympathies.  However, none is required.  I plan to get through this
mess and return to normal eventually.  The trick is not about modern
medicine or money.  It's about surviving bad scheduling, hospital
super-bugs, medical mistakes, and oddly about practicing medicine from
a lawsuit inspired medical cookbook.  So far they've only tried to
kill me once (by accident), but most everything else is going fairly
smoothly.

>Can I ask why the procedure failed first time?

Laser lithotripsy.  The laproscope is about 5.5mm wide.  They were
only able to enlarge the entry hole from the ureter to the kidney to
about 3mm dia.  (Note that stents are normally sized by circumference,
not diameter).  Any larger, and I started bleeding profusely due to my
being on blood thinner (Plavix).  The surgeon was unable to get the
laser into the kidney.  So, they left a 2mm dia stent in place to
eliminate the painful backpressure, patched me up, dropped the blood
thinners form my growing prescription list, released me on
Thanksgiving evening, and asked me to call on Monday for round two. My
best guess(tm) is the next attempt will be using PCNL:
"How are Kidney Stones Treated?"
<https://www.urologyhealth.org/urologic-conditions/kidney-stones/treatment>

I had the same laser lithotripsy procedure 10 years ago for removing a
previous boulder.  It works, I recommend it, but has some limitations.
The big one is that it only breaks up the boulder, and does NOT remove
the debris.  That took about 10 days and was Level 10 agony for the
entire period.  The not so big limitation is that running a laproscope
through a rather sensitive part of my anatomy can be rather painful
when later trying to urinate.  I've repeatedly asked for some 5%
lidocaine topical ointment to deaden the nerves, which has been
repeatedly "forgotten".  I wanted to mix my own using some illegal
cocaine, but failed to find my 30 year old stash.

If you want more details, email please.

-- 
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

On 26/11/2018 04:19, Jeff Liebermann wrote:
> On Mon, 26 Nov 2018 03:33:59 +0000, Mike Perkins <spam@spam.com>
> wrote:
> 
>> On 24/11/2018 19:33, Jeff Liebermann wrote:
>> <snip>
>>> Drivel and status report:  Just escaped from the hospital.  Laser
>>> lithotripsy to remove one kidney stone failed.  I go back in a week or
>>> so to try again.  A month later, I repeat the ceremony to remove the
>>> other boulder.  I'll be rather scarce in the forums and mailing lists
>>> until I'm recovered.
> 
>> First of all my sympathies.
> 
> Thanks, and also my thanks to others who also offered their
> sympathies.  However, none is required.  I plan to get through this
> mess and return to normal eventually.  The trick is not about modern
> medicine or money.  It's about surviving bad scheduling, hospital
> super-bugs, medical mistakes, and oddly about practicing medicine from
> a lawsuit inspired medical cookbook.  So far they've only tried to
> kill me once (by accident), but most everything else is going fairly
> smoothly.

I was speaking from experience from 2 failed laser lithotripsy and one 
successful, and in the mean time two rounds of SWL. This went on for 
months! Mine was 11mm.

>> Can I ask why the procedure failed first time?
> 
> Laser lithotripsy.  The laproscope is about 5.5mm wide.  They were
> only able to enlarge the entry hole from the ureter to the kidney to
> about 3mm dia.  (Note that stents are normally sized by circumference,
> not diameter).  Any larger, and I started bleeding profusely due to my
> being on blood thinner (Plavix).  The surgeon was unable to get the
> laser into the kidney.  So, they left a 2mm dia stent in place to
> eliminate the painful backpressure, patched me up, dropped the blood
> thinners form my growing prescription list, released me on
> Thanksgiving evening, and asked me to call on Monday for round two. My
> best guess(tm) is the next attempt will be using PCNL:
> "How are Kidney Stones Treated?"
> <https://www.urologyhealth.org/urologic-conditions/kidney-stones/treatment>

I'm aware the ureter is a very sensitive and easily torn, so I can 
understand the reluctance to do anything to compromise the small tube.

> I had the same laser lithotripsy procedure 10 years ago for removing a
> previous boulder.  It works, I recommend it, but has some limitations.
> The big one is that it only breaks up the boulder, and does NOT remove
> the debris.  That took about 10 days and was Level 10 agony for the
> entire period.  The not so big limitation is that running a laproscope
> through a rather sensitive part of my anatomy can be rather painful
> when later trying to urinate.  I've repeatedly asked for some 5%
> lidocaine topical ointment to deaden the nerves, which has been
> repeatedly "forgotten".  I wanted to mix my own using some illegal
> cocaine, but failed to find my 30 year old stash.
> 
> If you want more details, email please.

LOL - been there and got the T-shirt!

I have heard women say the pain is as bad as childbirth.

So when I'm told about the pain of childbirth I say that I've heard from 
ladies it's on par with kidney stones. Naturally when they say 'have you 
had a child', I counter with 'have you had a kidney stone'!


-- 
Mike Perkins
Video Solutions Ltd
www.videosolutions.ltd.uk