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#11
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Lithium Ion vs NiMh battery
On 10/22/2017 3:51 PM, James wrote:
On 22/10/17 11:31, Oculus Lights wrote: Here's my source for Panasonic 18650 LI cells: https://liionwholesale.com/?refer1=a...RoCFkgQAvD_BwE Support a good American distributor selling tested and verified batteries, at competitive prices even for small quantities. They also sell the 6 cell LUC brand charger and 4 bay Opus analyzer/charger. These test out in my Opus tester/charger at 3500+mAH in both charging and discharging. I test charging at 2A and drain at 1A,the Opus' limit. Burn time in the light is measured at each step from 9A max (in the 3000Extreme) down to 70mA. My 26650 come in large quantities through a direct rep from Heter, a humongous scale better maker in China who makes many cells for other big brand name electronic companies, who are considered to make their own, but don't. Minimum quantities in the 1000 lot size for the measured 5500mAH unbranded ones I get for the Oculus lights and sell competitively versus the Chinesium crap. Maybe ~1 in 100 might not be up to spec, and only two out of 1000 have been DOA. The blue Tenergy brand 26650, unchipped, sold in Fry's, with a black seal around the + end contact, are likely the same but at Fry's much higher retail price, but never know the true capacity without testing, draining, recharging, repeatedly for at least a hundred cycles. Another problem with Chinesium is that they tend not to last nearly as many charge cycles as authentic first quality batteries, regardless of the capacity when allegedly new. That versus one of the Heter's I've been charging and draining almost daily since February, that still test charges at 5500mAH. The battery for my light went flat the other day so I ate a banana, drank some water, and it was recharged. (Dynamo users humour) +1 (fellow meat-power vehicle rider) -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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#12
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Lithium Ion vs NiMh battery
On Sunday, October 22, 2017 at 5:06:43 PM UTC-4, AMuzi wrote:
On 10/22/2017 3:51 PM, James wrote: On 22/10/17 11:31, Oculus Lights wrote: Here's my source for Panasonic 18650 LI cells: https://liionwholesale.com/?refer1=a...RoCFkgQAvD_BwE Support a good American distributor selling tested and verified batteries, at competitive prices even for small quantities. They also sell the 6 cell LUC brand charger and 4 bay Opus analyzer/charger. These test out in my Opus tester/charger at 3500+mAH in both charging and discharging. I test charging at 2A and drain at 1A,the Opus' limit. Burn time in the light is measured at each step from 9A max (in the 3000Extreme) down to 70mA. My 26650 come in large quantities through a direct rep from Heter, a humongous scale better maker in China who makes many cells for other big brand name electronic companies, who are considered to make their own, but don't. Minimum quantities in the 1000 lot size for the measured 5500mAH unbranded ones I get for the Oculus lights and sell competitively versus the Chinesium crap. Maybe ~1 in 100 might not be up to spec, and only two out of 1000 have been DOA. The blue Tenergy brand 26650, unchipped, sold in Fry's, with a black seal around the + end contact, are likely the same but at Fry's much higher retail price, but never know the true capacity without testing, draining, recharging, repeatedly for at least a hundred cycles. Another problem with Chinesium is that they tend not to last nearly as many charge cycles as authentic first quality batteries, regardless of the capacity when allegedly new. That versus one of the Heter's I've been charging and draining almost daily since February, that still test charges at 5500mAH. The battery for my light went flat the other day so I ate a banana, drank some water, and it was recharged. (Dynamo users humour) +1 (fellow meat-power vehicle rider) -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 Well, I don't know what the problem was with the Lithium battery I had nor did I care once I found out that the NiMh battery worked as well and each charge was a lot longer. Dynamo hubs are out for me because I use my light on a number of different bicycles depending on what any particular ride is for. It'd cost me afortune to a dynamo hub on all of my bikes. I made my original post in this thread just to inform people that a NiMh battery can be used instead of a Lithium one as long as the voltages are the same. Cheers |
#13
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Lithium Ion vs NiMh battery
On Sunday, October 22, 2017 at 1:07:26 PM UTC-7, Ian Field wrote:
"Jeff Liebermann" wrote in message ... On Fri, 20 Oct 2017 21:40:42 -0700 (PDT), Sir Ridesalot wrote: A while back I asked about using an external NiMh battery instead of an external Lithium Ion battery on a light that came with a Lithium Ion battery. Due to a problem with the Lithium Ion battery pack of mine not holding a charge or for some other reason battery related for the light suddenly going out I put a Tamiya connector onto the light's wire and used my NiMh battery. Guess what? It works perfectly and my battery run time is a LOT longer now than what it was. Seeing as I have a few of these 5000Mah NiMh batteries from my RC boats I can now ride VERY FAR at night with no worry about the light going out suddenly or dimming drastically at low speeds or when stopped. My guess(tm) is that there is either something wrong with your LiIon battery pack, or the LiIon battery pack was assembled using cheap junk LiIon cells. I've seen both, mostly from 18650 cells. Identifying counterfeit cells is difficult: https://batterybro.com/blogs/18650-wholesale-battery-reviews/104619270-can-you-identify-the-fake-lg-hg2-18650-battery I used to weigh the cells and compare them with a known good cell, but that hasn't worked since the counterfeiters started adding waxes sand to the cell to increase the weight. All my 18650s were rescued from discarded laptop packs - if I get any duds, there's no point complaining to anyone. The 3W Tesco headlamp uses one, but my biggest application is my e cigarette. That's been in service well over 5yrs and I've only had to swap out a couple of battery sets. The one that came with the Tesco unit is only 1800mAh - I get a lot more running time from salvaged cells. Laptop battery packs used to be great sources for core cells. The big laptop battery recall in 07-08 sent case loads of new packs to large companies. Problem with the packs that was causing fires was cheap charging controllers, and poor design that put groups of three cells in parallel without regulating charging between each cell. That resulted in some cells being forced to absorb power beyond safe charging capacity if one cell was substandard or dropped off a tenth of a volt after many charges. Instructions were given NOT to return old packs, to dispose of locally. That gave me a huge harvest of 2800 Samsungs and Panasonics from Lenovo and Dell packs, for my early lights. |
#14
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Lithium Ion vs NiMh battery
On 10/22/2017 5:06 PM, AMuzi wrote:
On 10/22/2017 3:51 PM, James wrote: On 22/10/17 11:31, Oculus Lights wrote: Here's my source for Panasonic 18650 LI cells: https://liionwholesale.com/?refer1=a...RoCFkgQAvD_BwE Â*Support a good American distributor selling tested and verified batteries, at competitive prices even for small quantities.Â* They also sell the 6 cell LUC brand charger and 4 bay Opus analyzer/charger. These test out in my Opus tester/charger at 3500+mAH in both charging and discharging.Â* I test charging at 2A and drain at 1A,the Opus' limit.Â* Burn time in the light is measured at each step from 9A max (in the 3000Extreme) down to 70mA. My 26650 come in large quantities through a direct rep from Heter, a humongous scale better maker in China who makes many cells for other big brand name electronic companies, who are considered to make their own, but don't. Minimum quantities in the 1000 lot size for the measured 5500mAH unbranded ones I get for the Oculus lights and sell competitively versus the Chinesium crap.Â* Maybe ~1 in 100 might not be up to spec, and only two out of 1000 have been DOA. The blue Tenergy brand 26650, unchipped, sold in Fry's, with a black seal around the + end contact, are likely the same but at Fry's much higher retail price, but never know the true capacity without testing, draining, recharging, repeatedly for at least a hundred cycles.Â* Another problem with Chinesium is that they tend not to last nearly as many charge cycles as authentic first quality batteries, regardless of the capacity when allegedly new.Â* That versus one of the Heter's I've been charging and draining almost daily since February, that still test charges at 5500mAH. The battery for my light went flat the other day so I ate a banana, drank some water, and it was recharged. (Dynamo users humour) +1 (fellow meat-power vehicle rider) +2, unless we're counting dynamos instead of riders. I think I'd be about +5 or +6 then. -- - Frank Krygowski |
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Lithium Ion vs NiMh battery
On 10/21/2017 9:52 AM, somebody wrote:
snip For me a Chinese li-ion cell is good if it measures 3/4 the label capacity. Resellers will ship good batteries until they have a decent number of good reviews and them start shipping the crap cells. So if you buy some measure capacity right away. Document the results with photos. Then go back to eBay or Aliexpress and go through the dispute process. Works for me. Fry's often has these on sale for $4.99 http://www.frys.com/product/7161562 and they are good. |
#16
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Lithium Ion vs NiMh battery
On Sun, 22 Oct 2017 21:07:22 +0100, "Ian Field"
wrote: All my 18650s were rescued from discarded laptop packs - if I get any duds, there's no point complaining to anyone. I have a small collection of such batteries. The problem is that the spot welded + terminal is flat and is missing the "button top" used in most removable 18650 cells. I had to buy a few magnetic "button tops" which work well enough, but are easily lost or misplaced: https://www.ebay.com/itm/282578704173 My testing, using a West Mountain Radio CBA-II discharge tester, showed that the cells market 2200 ma-hr delivered 2000 ma-hr at 1.5A. Good enough. The 3W Tesco headlamp uses one, but my biggest application is my e cigarette. That's been in service well over 5yrs and I've only had to swap out a couple of battery sets. Between the eCigarettes, eBikes, LED lighting enthusiasts, power tools, and radio geeks, it's a wonder that one can find 18650 cells. The one that came with the Tesco unit is only 1800mAh - I get a lot more running time from salvaged cells. I recently bought a few of the lowest priced 18650 on eBay. Garbage in, lumens out. These were suppose to be 5800 and 5000 ma-hr but delivered 1000 and 880 ma-hr: http://802.11junk.com/jeffl/battery-tests/18650.jpg After about 10 charge/discharge cycles, the 5000 ma-hr cell is showing signs impending failure. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#17
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Lithium Ion vs NiMh battery
On 23/10/17 10:42, Sir Ridesalot wrote:
Dynamo hubs are out for me because I use my light on a number of different bicycles depending on what any particular ride is for. It'd cost me afortune to a dynamo hub on all of my bikes. A first world problem of too many bicycles. -- JS |
#18
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Lithium Ion vs NiMh battery
On 10/22/2017 11:19 PM, James wrote:
On 23/10/17 10:42, Sir Ridesalot wrote: Dynamo hubs are out for me because I use my light on a number of different bicycles depending on what any particular ride is for. It'd cost me afortune to a dynamo hub on all of my bikes. A first world problem of too many bicycles. Whenever I have to replace a wheel on a mid-range bicycle then I will get a dynamo hub wheel. The cost differential is about $50 for a wheel with a 3W Shimano or Sanyo dynamo. For a high-end dynamo (SP) you're looking at another $150, but I have not had any issues with the lower-end dynamos. But I have to say, with my Lezyne 1500 lumen light, with internal batteries and USB rechargeable, the need for a dynamo is greatly reduced. I bought extra mounts and put them on multiple bicycles. A dynamo light alone is not sufficient for most urban riding in the U.S.. |
#19
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Lithium Ion vs NiMh battery
On 10/22/2017 8:13 PM, Jeff Liebermann wrote:
Between the eCigarettes, eBikes, LED lighting enthusiasts, power tools, and radio geeks, it's a wonder that one can find 18650 cells. Or a Tesla battery pack. 8,256 18650 cells in one pack. |
#20
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Lithium Ion vs NiMh battery
On 10/22/2017 8:13 PM, Jeff Liebermann wrote:
On Sun, 22 Oct 2017 21:07:22 +0100, "Ian Field" wrote: All my 18650s were rescued from discarded laptop packs - if I get any duds, there's no point complaining to anyone. I have a small collection of such batteries. The problem is that the spot welded + terminal is flat and is missing the "button top" used in most removable 18650 cells. I had to buy a few magnetic "button tops" which work well enough, but are easily lost or misplaced: https://www.ebay.com/itm/282578704173 My testing, using a West Mountain Radio CBA-II discharge tester, showed that the cells market 2200 ma-hr delivered 2000 ma-hr at 1.5A. Good enough. The 3W Tesco headlamp uses one, but my biggest application is my e cigarette. That's been in service well over 5yrs and I've only had to swap out a couple of battery sets. Between the eCigarettes, eBikes, LED lighting enthusiasts, power tools, and radio geeks, it's a wonder that one can find 18650 cells. The one that came with the Tesco unit is only 1800mAh - I get a lot more running time from salvaged cells. I recently bought a few of the lowest priced 18650 on eBay. Garbage in, lumens out. These were suppose to be 5800 and 5000 ma-hr but delivered 1000 and 880 ma-hr: http://802.11junk.com/jeffl/battery-tests/18650.jpg After about 10 charge/discharge cycles, the 5000 ma-hr cell is showing signs impending failure. Oh please, did you really expect 5800 mAH from an 18650? There is no such thing! The cheapest way to buy flat top 18650 cells is to buy one of those USB battery packs. Fry's has a 16,800 mAH model comprised of six 2800mAH 18650 cells for $17. That's $2.83 per cell. For button-top cells, the source that Barry Beams provided is probably the best option. I.e. for button-top https://liionwholesale.com/collections/batteries/products/protected-panasonic-ncr18650b-3400mah-li-ion-18650-button-top-battery?variant=1925834564. |
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