I have buy a ultrafire 18650 6800mah battery for making DIY power bank, so my question is, is this battery really has 6800 mah? If it is real the I used 4 battery's it means 4X6850=27200mah is that true. Please tell me someone...
Charging time for Ultrafire 18650 6800 mAh battery
Started by ●March 10, 2017
Reply by ●December 8, 20182018-12-08
Reply by ●December 8, 20182018-12-08
On Saturday, 8 December 2018 18:27:26 UTC, 007chava...@gmail.com wrote:> I have buy a ultrafire 18650 6800mah battery for making DIY power bank, so my question is, is this battery really has 6800 mah? If it is real the I used 4 battery's it means 4X6850=27200mah is that true. Please tell me someone...No.
Reply by ●December 8, 20182018-12-08
On Saturday, December 8, 2018 at 1:27:26 PM UTC-5, 007chava...@gmail.com wrote:> I have buy a ultrafire 18650 6800mah battery for making DIY power bank, so my question is, is this battery really has 6800 mah? If it is real the I used 4 battery's it means 4X6850=27200mah is that true. Please tell me someone...Are you connecting the batteries in parallel or in series? If you connect batteries in series the voltages add, but the current rating (mAHr) remains the same. If you connect the batteries in parallel the voltage is the same, but the currents are added. None of this says anything about the accuracy of the claimed 6800 mAHr rating of the Ultrafire cells. Rick C. Tesla referral code - https://ts.la/richard11209
Reply by ●December 8, 20182018-12-08
On Monday, November 26, 2018 at 3:18:58 PM UTC+11, 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. > > >Can I ask why the procedure failed first time? > > Laser lithotripsy.My sympathy too. Laser lithotripsy didn't work for me either (as you may recall) but the ultra-sound lithotriptor did. It did leave me feeling that I'd been punched in the back by something substantial, but that was strictly soft-tissue damage and stopped worrying me after a day lying down and taking as much iboprufen as the label suggests is prudent. The ultra sound system does seem to break up kidney stones pretty thoroughly. -- Bill Sloman, Sydney
Reply by ●December 8, 20182018-12-08
On Sat, 8 Dec 2018 10:27:21 -0800 (PST), 007chavanruturaj@gmail.com wrote:>I have buy a ultrafire 18650 6800mah battery for making DIY power bank, so my question is, is this battery really has 6800 mah? If it is real the I used 4 battery's it means 4X6850=27200mah is that true. Please tell me someone...No. They are junk. My measurements on a single UltraFire 18650 cell shows about 800 ma-hr. Google shows 33 posts by 23 authors all of which indicate that the 6800 ma-hr printed rating is a fabrication and impossible to achieve with even the best consumer grade LiIon 18650 cells available. At best, you might be able to deliver about 2500 ma-hr. Please read or re-read my original reply to your question, or to someone who may be nym shifting a gmail address: <https://groups.google.com/d/msg/sci.electronics.design/bRStFgNxNJQ/Aq-7ILWxAQAJ> -- 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
Reply by ●December 9, 20182018-12-09
On 2018-12-08, 007chavanruturaj@gmail.com <007chavanruturaj@gmail.com> wrote:> I have buy a ultrafire 18650 6800mah battery for making DIY power > bank, so my question is, is this battery really has 6800 mah?no it's a fake. -- When I tried casting out nines I made a hash of it.
Reply by ●December 9, 20182018-12-09
On Sat, 8 Dec 2018 10:27:21 -0800 (PST), 007chavanruturaj@gmail.com wrote:>I have buy a ultrafire 18650 6800mah battery for making DIY power bank, so my question is, is this battery really has 6800 mah? If it is real the I used 4 battery's it means 4X6850=27200mah is that true. Please tell me someone...No 18650 LiIon cell is 6800mAh. Half that would be dreaming.
Reply by ●December 9, 20182018-12-09
On Sat, 8 Dec 2018 19:31:04 -0800 (PST), bill.sloman@ieee.org wrote:>On Monday, November 26, 2018 at 3:18:58 PM UTC+11, 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. >> >> >Can I ask why the procedure failed first time? >> >> Laser lithotripsy.>My sympathy too. Laser lithotripsy didn't work for me either (as you >may recall) but the ultra-sound lithotriptor did.I can't do ESWL (extracorporeal shock wave lithotripsy). The left rock decided it was time to leave the kidney and ended up stuck in the ureter. The CT scan also showed that it's much too dense at 1500 HU (Hounsfield Units) to fracture with ultrasound. Methinks the limit is 900 HU. I'm scheduled for another CT scan on Monday, and if the stone cooperates, the doctors will be playing laser tag with it on Tuesday. There's a fair chance that I may have already passed the left stone but have no way to tell because I have a stent installed to relieve the back pressure and therefore no pain. Stone Size, Density Matter <https://www.renalandurologynews.com/news/stone-size-density-matter/article/30140/>>It did leave me feeling that I'd been punched in the back by something >substantial, but that was strictly soft-tissue damage and stopped >worrying me after a day lying down and taking as much iboprufen as >the label suggests is prudent.I was taking vicodin for the pain. It still hurts, but I didn't care. Imagine a constipated zombie at the keyboard.>The ultra sound system does seem to break up kidney stones pretty thoroughly.Only if the stones are not very dense. My stones don't qualify. -- 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
Reply by ●December 9, 20182018-12-09
gnuarm.deletethisbit@gmail.com a exprim� avec pr�cision :> On Saturday, December 8, 2018 at 1:27:26 PM UTC-5, 007chava...@gmail.com > wrote: >> I have buy a ultrafire 18650 6800mah battery for making DIY power bank, so >> my question is, is this battery really has 6800 mah? If it is real the I >> used 4 battery's it means 4X6850=27200mah is that true. Please tell me >> someone... > > Are you connecting the batteries in parallel or in series? If you connect > batteries in series the voltages add, but the current rating (mAHr) remains > the same. If you connect the batteries in parallel the voltage is the same, > but the currents are added.+1 It is strange that someone without such basic knowledge atempt DIY with Li/ion batteries. I hope you have a good insurance.
Reply by ●December 9, 20182018-12-09
On 9/12/18 3:03 pm, krw@notreal.com wrote:> On Sat, 8 Dec 2018 10:27:21 -0800 (PST), 007chavanruturaj@gmail.com > wrote: > >> I have buy a ultrafire 18650 6800mah battery for making DIY power bank, so my question is, is this battery really has 6800 mah? If it is real the I used 4 battery's it means 4X6850=27200mah is that true. Please tell me someone... > > No 18650 LiIon cell is 6800mAh. Half that would be dreaming.Buy some genuine Panasonic NCR cells. They test at their spec, 3400mAh. You'll think you're dreaming, but it's real. :)
