A show about batteries - Part 1
I can't take the credit for all this detailed information in my podcast, I found this fantastic website many years ago while investigating why the battery in my expensive razor prematurely failed. I tried to hunt for the site but couldn't find it. I wrote up all my notes from memory and recorded the show. It wasn't until I started working on part 2 of my batteries show that I stumbled across this long forgotten site - at least I think it's the same one as it talks about the memory effect on satellites and doctor's pagers so I guess it must be the same one. I'm indeed delighted to find it still exists, and I may very well read it again from top to bottom. It looks like it's been updated a little too. Well done ka7oei a fantastic resource right enough.
Site title: "About NiMH and NiCd cells and batteries (And a little about LiIons, too...)" http://www.ka7oei.com/nicds.html
A picture of my trusty Philips 5890 Shaver http://urun.gittigidiyor.com/kozmetik-kisisel-bakim/philips-philishave-5890-tras-makinasi-77027302
Memory effect http://en.wikipedia.org/wiki/Memory_effect
Doctor's pager http://en.wikipedia.org/wiki/Pager
Sansa Clip http://en.wikipedia.org/wiki/Sansa_Clip#Sansa_Clip
Two Possible Chargers (For use in the UK)
I found it very difficult to find a slow trickle charger, here are two possibilities, you may need to settle for a fast charger as the slow ones now seem to be like hen's teeth, (VERY HARD TO GET).
This is perhaps a little slow with a charge current of only 150ma, would take about 17Hrs to charge 2100 mAh batteries.
The charger I use is made by the same company as this although mine is a different model. My model charges at 200ma, and takes about 13 Hrs to charge a 2100 mAh battery. I can't tell what charge current this charger deliveries, but suspect it's a simple slow charger, probably old stock, as I said slow chargers are getting like hen's teeth.
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Comment #1 posted on 2013-12-12T11:36:39Z by Mark Waters
Just wanted to say thanks for this episode , it was well produced and very informative.
Comment #2 posted on 2013-12-19T13:19:29Z by pokey
I really enjoyed this episode. Some of it I already knew, and most of it was new to me. I like when I know a little something when I start. It gives me more confidence in the new information.
I have a couple of questions that I hope you wouldn't mind answering in a follow-up episode.
1.) What was learned in 2011 that completed our understanding of how batteries work?
2.) I forget my second question, but it was a good one. :(
As an aside, I have had really good results with Nickel Metal Hydride rechargeable batteries. They hold a charge for weeks and weeks with no noticeable drop in their run time, they store a good amount of energy (2200 mAh for size AA) and have a nice long runtime. I had one set of four AA batteries that I swapped back and forth in my flashlight (which takes two at a time) for almost five years. Sadly, I lost the flashlight with two of them in it, but I still have the other two in my Mintyboost, and they seem as good as ever.
Comment #3 posted on 2013-12-22T17:44:41Z by MrX
Hi Mark, very sorry for the long delay in getting back to you, finding the time sometimes can be difficult. Thanks for the kind words, glad you enjoyed the episode, am still trying to find the time to do part 2, hopefully won't be too much longer.
Hi pokey, again very sorry for the long delay in getting back to you
To answer you 1st question:-
A lead acid battery consists of lead electrode and one side and lead oxide at the other, lead oxides don't normally conduct electricity. Apparently it was only in 2011 that we figured out how it was working. When electrons travel between the electrodes the lead oxide looses oxygen transforming itself into a conductor.
Hope this answer question
Sounds like your also a bit of a battery fan, just goes to show that batteries can last for years (if you look after them). Had a look at the Mintyboost, sounds very interesting, I would imagine it will be very handy :)