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#101
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Is there any good non-rechargeable headlights anymore?
On 5/15/2017 6:21 PM, Jeff Liebermann wrote:
On Mon, 15 May 2017 17:14:28 -0700, sms wrote: There had to have been a board in there because there were multiple power levels, and flash mode. Yep. Something like this: http://www.ebay.com/itm/222134093111 The light came on very bright, for a few seconds, before destroying the LED or the driver. Sounds about right for overheating. Over voltage would blow it up instantly, while overheating takes some time. The usual culprit for overheating is lousy heat sinking on the LED or regulator circuitry. I had one Chinese flashlight where the LED got so hot that in unsoldered itself from the board. It's not trivial to get a good thermal solution for these high power LEDs. Look at the schemes being used in LED car headlights, some of which have active cooling. The newer high-lumen bicycle lights have moved to multiple LEDs. The better ones have temp sensors that reduce the current to the LED when they get too hot. We've traded the hot filament of incandescent bulbs for the hot semiconductor junction of LEDs. There's no free lunch. But on incandescent bulbs the heat comes out through a pretty large area of glass. |
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#102
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Is there any good non-rechargeable headlights anymore?
On Tuesday, May 16, 2017 at 10:26:11 AM UTC-4, wrote:
On Monday, May 15, 2017 at 3:22:28 PM UTC-7, sms wrote: On 5/15/2017 9:30 AM, Jeff Liebermann wrote: snip https://en.wikipedia.org/wiki/Eneloop Using 4th generation numbers: AAA 3 cells * 800 ma-hr * 1.5v = 3.6 watt-hrs AA 2 cells * 2000 ma-hr * 1.5v = 6.0 watt-hrs For a light that you're using every day, there's no upside in the Eneloop batteries. They reduce self-discharge with a separator that is thicker, decreasing the volume of chemicals. But if you're charging every day anyway, self-discharge is not an issue. Also, the Eneloop Pro AA are about 2500mAH and there are non-low-self-discharge NiMH cells that deliver 2700mAH. The Eneloop Pro AAA are about 950mAH. This sounds like exactly the thing for a bicycle headlight. right, its like reading about Venezoola |
#103
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Is there any good non-rechargeable headlights anymore?
On Mon, 15 May 2017 15:19:08 -0700, sms
wrote: On 5/15/2017 9:30 AM, Jeff Liebermann wrote: snip https://en.wikipedia.org/wiki/Eneloop Using 4th generation numbers: AAA 3 cells * 800 ma-hr * 1.5v = 3.6 watt-hrs AA 2 cells * 2000 ma-hr * 1.5v = 6.0 watt-hrs For a light that you're using every day, there's no upside in the Eneloop batteries. They reduce self-discharge with a separator that is thicker, decreasing the volume of chemicals. But if you're charging every day anyway, self-discharge is not an issue. Also, the Eneloop Pro AA are about 2500mAH and there are non-low-self-discharge NiMH cells that deliver 2700mAH. The Eneloop Pro AAA are about 950mAH. http://batteryuniversity.com/learn/article/elevating_self_discharge The self discharge rate for non-LSD NiMH cells is: 10-15% in 24h, then 10-15% per month and: The self-discharge of all battery chemistries increases at higher temperature, and the rate typically doubles with every 10°C (18°F). Good enough for commuting. It also mentions that a standard NiMH cell is only good for 300-400 charge cycles. That's effectively new batteries every year. I would prefer Eneloop cells, which are good for 2100 charge cycles. https://en.wikipedia.org/wiki/Eneloop#AA_size You're right that if you use NiMH for an every day commuting light, ordinary NiMH will work just fine. However, if you wait a month or more between rides, it would be best to recharge before riding. I've been conducting something of an experiment to see just how bad Chinese 18650 cells are. When tested on my West Mtn Radio CBA-II discharge tester at 1.3A or 1.5A (appoximately what a headlight or flashlight might draw in low power), I'm seeing 850 ma-hr to 1200 ma-hr. Never mind that these cells are mislabeled 3800 ma-hr to 5500 ma-hr. I've also purchased some of the "Belch Fire" type cells, which run about the same capacity. Typical cost is about $1/ea: A typical UltraFire 18650 cell: http://802.11junk.com/jeffl/LiPo/Ultrafire%20LiPo%203000%20ma-hr%2018650%20test.jpg A preliminary graph of what I'm seeing with cheap 18650 cells: http://802.11junk.com/jeffl/battery-tests/18650.jpg It seems to me that although these junk batteries don't come close to the advertised specs or user expectations, they are adequate for short rides and commuting. I'll know more after I try to kill a few of them. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#104
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Is there any good non-rechargeable headlights anymore?
AE6KS por favor
let us know if the NiMH and Enloop batteries, and Belchfire, are relevant to the efficiency of buying n using Energizer Lion and competitive use in bicycle LED lights. or why the NiMH Enloop Belchfire digression ? to cut to the core so to speak n clear the air |
#105
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Is there any good non-rechargeable headlights anymore?
On Tuesday, May 16, 2017 at 5:52:10 PM UTC-4, wrote:
AE6KS por favor let us know if the NiMH and Enloop batteries, and Belchfire, are relevant to the efficiency of buying n using Energizer Lion and competitive use in bicycle LED lights. or why the NiMH Enloop Belchfire digression ? to cut to the core so to speak n clear the air Generally, NiMH batteries that are properly cared for (charged and used often, stored in a cool, dry place, and not dropped) will last for 500 – 1000 charges or approximately two to three years. Remember, the more you use and charge NiMH, the longer they will last. http://www.thomasdistributing.com/Ba...s_ep_46-1.html http://www.cateye.com/en/products/detail/HL-EL540RC/ http://www.cateye.com/en/keywords/result/ so everyone uses NiMH in NIMH designed for headlamps ? ( tried energizer recharables using an energizer recharger bought Walmart with zeroooo results. trash. abt 15 years ago ) |
#107
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Is there any good non-rechargeable headlights anymore?
On 5/10/2017 9:56 PM, sms wrote:
On 5/10/2017 5:44 PM, DougC wrote: snip I can make mounts too but don't really wanna. Yeah, I make mounts. Not because I really wanna, but because I can make mounts that are a lot better than what is commercially available. I use the Maglite Delrin clamps on a piece of aluminum flat bar mounted to an aluminum or steel clamp for the bars. Well it looks like I'll be making mounts after all. The most-capable-looking ones on Amazon don't look like they're going to do too well here. |
#108
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Is there any good non-rechargeable headlights anymore?
AE6KS ace !
http://www.cateye.com/en/products/detail/HL-EL540RC/ sez the unit accepts NiMH and LIon 4000 cd ? a new unit for me. ................... I adopt a standard consumer ID. The presence of NiMH headlamps at Cateye is a surprise. I like Cateye...like Ford or P&R or Kellog .....Crest. Years back, NiMH was introduced via several instructions as part of the Evil Empire. Years ago so we wind up here with a huge dialogue of NiMH and Lion and then when I look for Cateye's opinion I see NiMH Cayeye's. **** ! I bought a bag of Lion rechargeables from Amazon. Stored in my bullet nose Studebaker. so with Cateye offering a light doing NiMH and Lion then there is consumer effectiveness.... if true..... I accept Cateye's production wisdom. If we can buy a or 2 eco Cateyes for around the block with ADEQUATE RUNNING TIMES POST CHARGE from the NIMH then Holy Moly Batman Lion is toast. however, this is not apparent at the Wal Kiosk. How's Costco ? |
#109
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Is there any good non-rechargeable headlights anymore?
On Tuesday, May 16, 2017 at 12:16:57 PM UTC-7, wrote:
right, its like reading about Venezoola So what you're saying is that you don't want to hear what's really going on in the world - you prefer fake news from the major media. Gotcha. |
#110
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Is there any good non-rechargeable headlights anymore?
On Wednesday, May 17, 2017 at 9:28:49 AM UTC-4, wrote:
On Tuesday, May 16, 2017 at 12:16:57 PM UTC-7, wrote: right, its like reading about Venezoola So what you're saying is that you don't want to hear what's really going on in the world - you prefer fake news from the major media. Gotcha. gee whiz we were waiting for your comment on the Cateye NiMH BTW I contribute foreign policy analysis on a pro level. |
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