Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Other Stuff
Off Topic
Never buy these batteries
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="WayneF" data-source="post: 478703" data-attributes="member: 12496"><p>Scott, that 1.5V business is actually not quite the true picture. Look at this graph:</p><p></p><p><a href="http://panasonic.net/energy/battery/eneloop/technologies/#r=s" target="_blank">Technologies | eneloop | Panasonic Batteries Site</a></p><p></p><p>Also look at the second graph down the page, for zero degrees centigrade. </p><p> </p><p>Which voltage seems higher? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>This is Panasonic because they bought Sanyo, including Eneloop.</p><p></p><p>Alkalines may start at 1.5 or 1.6V, but they quickly drop to below the NiMH voltage. Because while NiMH (and most rechargeables) start lower, basically they hold there at a constant voltage for their life. During most of the life of both types, NiMH is HIGHER voltage than alkaline. There is more energy in the NiMH. Most simple electronic gear (like a mp3 player or TV remote control) quit at about 1.1 V. Which is nothing for NiMH to stay above that, but harder for alkaline. Alkaline recycles slower in our flashes too. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>That is a stylized graph, at only 500 ma current drain. Speedlights might pull 6000 ma during recycle (for a couple of seconds), so that curve is similar, but not quite as pretty, but that current is really really hard on alkalines. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>You have seen this same action in the battery charge status of little devices like a pocket mp3 player. NiMH starts out at only about 2/3 on the little meter, which is designed to show alkaline voltage drop. But NiMH will hold there for the life of the battery, until it suddenly quits.</p><p>Meanwhile, alkalines are sinking lower and lower, 1/2 and 1/3 and 1/4, until they quit. The battery status is simply a volt meter.</p><p></p><p>Probably the reason for a flash having no status meter, it would never show any change, but some users do use alkaline batteries. The recycle speed is still an indicator though, it gets slower and slower for alkaline, but holds in there for NiMH.</p><p></p><p>You can look at the data sheet curves for any NiMH or any alkaline, and see the same thing. But, higher current is a real big deal making the curves steeper. Where the NiMH may not look as pretty, the alkaline curve looks outright terrible, a straight line down. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>Here are the Eneloop data sheets:</p><p><a href="http://www.eneloop.eu/home/technology/data-sheets.html" target="_blank">Data-Sheets - Panasonic</a></p><p></p><p>Here is a Energizer alkaline e91 data sheet</p><p><a href="http://data.energizer.com/PDFs/E91.pdf" target="_blank">http://data.energizer.com/PDFs/E91.pdf</a></p><p></p><p></p><p></p><p></p><p>Yes, NiMH does, as did NiCd. Many NiCd are on a charger all the time. But the point of the Eneloop type (developed by Sanyo, licensed to many now) is that THEY don't self discharge in the same way. They do have a little smaller capacity than regular NiMH, maybe 25% less. So if you have a large photo shoot tomorrow involving hundreds of shots, maybe use regular NiMH for their larger capacity, but be sure to recharge them tonight.</p><p></p><p>But for most of us, taking maybe only a few flash pictures every week, or maybe snapshots on Easter and Christmas, Eneloops are a miraculous wonder.</p></blockquote><p></p>
[QUOTE="WayneF, post: 478703, member: 12496"] Scott, that 1.5V business is actually not quite the true picture. Look at this graph: [URL="http://panasonic.net/energy/battery/eneloop/technologies/#r=s"]Technologies | eneloop | Panasonic Batteries Site[/URL] Also look at the second graph down the page, for zero degrees centigrade. Which voltage seems higher? :) This is Panasonic because they bought Sanyo, including Eneloop. Alkalines may start at 1.5 or 1.6V, but they quickly drop to below the NiMH voltage. Because while NiMH (and most rechargeables) start lower, basically they hold there at a constant voltage for their life. During most of the life of both types, NiMH is HIGHER voltage than alkaline. There is more energy in the NiMH. Most simple electronic gear (like a mp3 player or TV remote control) quit at about 1.1 V. Which is nothing for NiMH to stay above that, but harder for alkaline. Alkaline recycles slower in our flashes too. :) That is a stylized graph, at only 500 ma current drain. Speedlights might pull 6000 ma during recycle (for a couple of seconds), so that curve is similar, but not quite as pretty, but that current is really really hard on alkalines. :) You have seen this same action in the battery charge status of little devices like a pocket mp3 player. NiMH starts out at only about 2/3 on the little meter, which is designed to show alkaline voltage drop. But NiMH will hold there for the life of the battery, until it suddenly quits. Meanwhile, alkalines are sinking lower and lower, 1/2 and 1/3 and 1/4, until they quit. The battery status is simply a volt meter. Probably the reason for a flash having no status meter, it would never show any change, but some users do use alkaline batteries. The recycle speed is still an indicator though, it gets slower and slower for alkaline, but holds in there for NiMH. You can look at the data sheet curves for any NiMH or any alkaline, and see the same thing. But, higher current is a real big deal making the curves steeper. Where the NiMH may not look as pretty, the alkaline curve looks outright terrible, a straight line down. :) Here are the Eneloop data sheets: [url=http://www.eneloop.eu/home/technology/data-sheets.html]Data-Sheets - Panasonic[/url] Here is a Energizer alkaline e91 data sheet [url]http://data.energizer.com/PDFs/E91.pdf[/url] Yes, NiMH does, as did NiCd. Many NiCd are on a charger all the time. But the point of the Eneloop type (developed by Sanyo, licensed to many now) is that THEY don't self discharge in the same way. They do have a little smaller capacity than regular NiMH, maybe 25% less. So if you have a large photo shoot tomorrow involving hundreds of shots, maybe use regular NiMH for their larger capacity, but be sure to recharge them tonight. But for most of us, taking maybe only a few flash pictures every week, or maybe snapshots on Easter and Christmas, Eneloops are a miraculous wonder. [/QUOTE]
Verification
Post reply
Forums
Other Stuff
Off Topic
Never buy these batteries
Top
