The relationship between charge and terminal voltage on different battery types is quite well documented AFAIK. US semi company Benchmarq [sp?] who were bought out by TI, brought out a range of chips to enable accurate charging. By measuring the terminal voltage, you should be able to establish charge levels and then appropriate charging currents to full charge.
On an iPhone and I would imagine Samsung, this functionality is built into the phone chipset.
The real issue with batteries IMV is the quality is plain rotten on a lot of them. How often don’t you buy a replacement battery off Amazon because the original OEM battery has failed after years of good use only to have the new one fail after a year? Notorious are camera battery packs and Ryobi, Black and Decker etc third party batteries. I have a VAX floor scrubber and bought a second third party battery for it (£45). The VAX charger refused to charge it so I had to return it and get an OEM battery at about £15 more. I made sure I kept the receipt.
On an iPhone and I would imagine Samsung, this functionality is built into the phone chipset.
The real issue with batteries IMV is the quality is plain rotten on a lot of them. How often don’t you buy a replacement battery off Amazon because the original OEM battery has failed after years of good use only to have the new one fail after a year? Notorious are camera battery packs and Ryobi, Black and Decker etc third party batteries. I have a VAX floor scrubber and bought a second third party battery for it (£45). The VAX charger refused to charge it so I had to return it and get an OEM battery at about £15 more. I made sure I kept the receipt.
Yes, third party batteries are a NO-NO!
My new AA charger comes recommended by powercell manufacturers:
No one, I repeat no one, rips ME off!
My new AA charger comes recommended by powercell manufacturers:
No one, I repeat no one, rips ME off!
I should add that the terminal voltage on a rechargeable battery is highly temperature dependent. If you root around on the web, you'll find the terminal voltage vs temperature curves, so cell temperature has to be accurately measured to be able to charge correctly. Obviously, cheap replacement batteries won't have sensors in place to do this.
My mood was not lightened today when my attempt to buy genuine Duracell Batteries at https://www.duracelldirect.co.uk/ resulted in failed transactions and my debit card being blocked.
I have no idea what happened, but after faffing around with my bank via text, order and credit-worthiness was restored. I have bought this on eBay for £21.90 from a trusted-looking seller.
https://www.ebay.co.uk/itm/266412756044
One can only hope it is a genuine Duracell, which I understand is as much good as two or three other batteries, and not a cheap Chinese knockoff.
My understanding is these things only last a few years anyway, though we can only wonder what cheap AA batteries @Galu puts in his unspecified Pentax.
I am cooking with gas on Dirac Spinors:
This is a highly commended YouTuber called Richard Behiel, who is noted for no-holds barred serious content rather than providing Quantum Mechanics in bite-size chunks for lazy people.
Already I am on top of SO(2) rotation symmetry and the full Spinor thing can't be far behind, though Michael Atiyah famously said that no-one understands Spinors.
Interestingly, Gravity waves , being Spin 2 sort of squish and squeeze Space whilst staying the same volume:
A Spinor, it seems, is the square root of a vector in one approach, and in spin half rotates at half the rate of the applied rotation.
Well, I could go on. But in the end we must wade through the high-level videos, rather than hope that notorious popularers like Ethan Siegel or Carlo Rovelli or even Sabine Hossenfelder can explain it simply. It's not simple.
Now I must get back to the video. I have little else to do while I await my new camera battery, arriving on the French holiday known as the Quinze Aout by some strange coincidence.
I have no idea what happened, but after faffing around with my bank via text, order and credit-worthiness was restored. I have bought this on eBay for £21.90 from a trusted-looking seller.
https://www.ebay.co.uk/itm/266412756044
One can only hope it is a genuine Duracell, which I understand is as much good as two or three other batteries, and not a cheap Chinese knockoff.
My understanding is these things only last a few years anyway, though we can only wonder what cheap AA batteries @Galu puts in his unspecified Pentax.
I am cooking with gas on Dirac Spinors:
This is a highly commended YouTuber called Richard Behiel, who is noted for no-holds barred serious content rather than providing Quantum Mechanics in bite-size chunks for lazy people.
Already I am on top of SO(2) rotation symmetry and the full Spinor thing can't be far behind, though Michael Atiyah famously said that no-one understands Spinors.
Interestingly, Gravity waves , being Spin 2 sort of squish and squeeze Space whilst staying the same volume:
A Spinor, it seems, is the square root of a vector in one approach, and in spin half rotates at half the rate of the applied rotation.
Well, I could go on. But in the end we must wade through the high-level videos, rather than hope that notorious popularers like Ethan Siegel or Carlo Rovelli or even Sabine Hossenfelder can explain it simply. It's not simple.
Now I must get back to the video. I have little else to do while I await my new camera battery, arriving on the French holiday known as the Quinze Aout by some strange coincidence.
Galu uses Duracell Recharge Ultra (NiMH/2500mAh).
They hold a charge for 5 years - handy as I only use my DSLR infrequently.
And, the Pentax is NOT unspecified - you can see the model in the image I posted earlier.
In the 'other place' we discussed Dirac's 'plate trick' or 'belt trick'. Here it is performed with a glass of water:
Paul Dirac offered this example to show that a spinor returns to its original state after two full rotations, but not after one.
I am not having it @Galu! 😡
I found your camera image lacking the sort of precision that a professional Mathematician or Engineer demands:
Even on 10X magnification the model number was indecipherable, and no mention was made of the NiMH rechargeable battery technology:
Whatever is this supposed to be? After much time wasted, I find it is the Pentax *ist DS camera.
Sadly, according to Ken Rockwell, just about the WORST camera ever made, and he clearly recommends my D60 Nikon or @TNT's 7d2 Canon cameras as much better:
https://www.kenrockwell.com/pentax/istDs.htm
TBH, I think he was a bit harsh and I am sure it takes adequate snaps of cats and babies, an' all that nonsense. 🤣
I have gleaned much about batteries lately. Here's the lowdown on your Pentax camera:
Some usage performance:
I didn't know this, but NiMH rechargeables have considerable memory effect, and should be run down completely before recharging, whereas Li-ion rechargeables prefer continuous topping up.
And clearly @TNT will not be using Alkalines up near frozen Stockholm where he resides in an igloo one supposes, fighting off polar bears.
https://www.kenrockwell.com/tech/batteries.htm
This means that old and flagging NiMH rechargeables can be revived somewhat by a couple of full cycles, which I must try, having a suitable charger with a discharge switch.
My understanding is Li-ion rechargeables can destroy certain older cameras, and always need a proper charger. It really is a minefield wherein one must read the manual.
I really can't believe the taciturn Paul Dirac would indulge in conjuring tricks with mobius belts and coffee cups to demonstrate the Dirac Electron Equation to bricklayers and such.
https://en.wikipedia.org/wiki/Plate_trick
Surely a full treatment of Quaternions, Special Unitary SU(3) and Special Orthogonal Lorentz SO(3,1) groups is more useful to the serious physicist? We are, after all, PROFESSIONALS. 😎
I found your camera image lacking the sort of precision that a professional Mathematician or Engineer demands:
Even on 10X magnification the model number was indecipherable, and no mention was made of the NiMH rechargeable battery technology:
Whatever is this supposed to be? After much time wasted, I find it is the Pentax *ist DS camera.
Sadly, according to Ken Rockwell, just about the WORST camera ever made, and he clearly recommends my D60 Nikon or @TNT's 7d2 Canon cameras as much better:
https://www.kenrockwell.com/pentax/istDs.htm
TBH, I think he was a bit harsh and I am sure it takes adequate snaps of cats and babies, an' all that nonsense. 🤣
I have gleaned much about batteries lately. Here's the lowdown on your Pentax camera:
Some usage performance:
I didn't know this, but NiMH rechargeables have considerable memory effect, and should be run down completely before recharging, whereas Li-ion rechargeables prefer continuous topping up.
And clearly @TNT will not be using Alkalines up near frozen Stockholm where he resides in an igloo one supposes, fighting off polar bears.
https://www.kenrockwell.com/tech/batteries.htm
This means that old and flagging NiMH rechargeables can be revived somewhat by a couple of full cycles, which I must try, having a suitable charger with a discharge switch.
My understanding is Li-ion rechargeables can destroy certain older cameras, and always need a proper charger. It really is a minefield wherein one must read the manual.
I really can't believe the taciturn Paul Dirac would indulge in conjuring tricks with mobius belts and coffee cups to demonstrate the Dirac Electron Equation to bricklayers and such.
https://en.wikipedia.org/wiki/Plate_trick
Surely a full treatment of Quaternions, Special Unitary SU(3) and Special Orthogonal Lorentz SO(3,1) groups is more useful to the serious physicist? We are, after all, PROFESSIONALS. 😎
Some 'Reviewer' Mr. Rockwell turns out to be! He starts off by admitting to having "no stick time with the *istDS yet"!
Later he states:
PERFORMANCE
I haven't seen one yet.
RECOMMENDATIONS
From what little I've read so far...
I could be proved wrong after trying one...
Would you buy a used car from this man?
However, Kuddly Ken does justify my choice of the Pentax *istDS which I made some 20 years ago.
"If you own a collection of Pentax lenses by all means consider this camera. Unlike Canon and Nikon the *istDS works fairly well with even ancient manual focus lenses, but check me on this."
That was precisely my situation at the time when graduating from a 35 mm film Pentax SLR. I had a collection of Pentax lenses including a compatible manual focus prime. A Pentax DSLR was obviously the most sensible and most cost effective choice of budget DSLR for me. I purchased mine, a clearance item, for a song from Currys.
As I'm sure Dirac himself would have said:
Well, if you got the camera cheap, that is OK I reckon. Cheap is always good, IMO. 😎
Amazingly the eBay price of my Duracell EN-EL9 battery has gone up to £24.90 in the last two days. Whatever is going on?
A quick calculation reveals this to be a swingeing 13.7% rise. 137 is an interesting number, of course, the Fine Structure Constant.
Sir Michael Atiyah claimed to have derived it from first principles, to the amazemant, and occasional doubt of Physicists.
I am now fully up to speed on the relation between SO(3) and SU(2), so this is progress.
Spinors are kinda mind-bending. Unitary means they sum to a circle radius One. And I keep seeing SQRT(1/2) = 0.707...
And here it is again:
Of course, half h(bar) is everything in Quantum Mechanics. So time well spent. 🙂
Amazingly the eBay price of my Duracell EN-EL9 battery has gone up to £24.90 in the last two days. Whatever is going on?
A quick calculation reveals this to be a swingeing 13.7% rise. 137 is an interesting number, of course, the Fine Structure Constant.
Sir Michael Atiyah claimed to have derived it from first principles, to the amazemant, and occasional doubt of Physicists.
I am now fully up to speed on the relation between SO(3) and SU(2), so this is progress.
Spinors are kinda mind-bending. Unitary means they sum to a circle radius One. And I keep seeing SQRT(1/2) = 0.707...
And here it is again:
Of course, half h(bar) is everything in Quantum Mechanics. So time well spent. 🙂
Oh alright Galu, if you insist!
https://www.flickr.com/photos/andrew_c_russell/with/27122880797
😉
Lots of Scotland there - even our kiwi friends are blown away by the scenery.
If the pics do look nice, it’s the Pentax and their lenses (with s Sigma 10-20mm 3.5 wide angle IIRC thrown in for good measure). There are some seriously good photographers on the forum - I’m just a happy snapper. Some of the pics on my Flickr account are with an iPhone.
Wife and I went out in the camper yesterday, looking forward to 5 days up in the Derbyshire hills but she decided to fall over the water butt and break her arm. Got out of A&E at 2 am The Scotland trip planed for September is now off.
https://www.flickr.com/photos/andrew_c_russell/with/27122880797
😉
Lots of Scotland there - even our kiwi friends are blown away by the scenery.
If the pics do look nice, it’s the Pentax and their lenses (with s Sigma 10-20mm 3.5 wide angle IIRC thrown in for good measure). There are some seriously good photographers on the forum - I’m just a happy snapper. Some of the pics on my Flickr account are with an iPhone.
Wife and I went out in the camper yesterday, looking forward to 5 days up in the Derbyshire hills but she decided to fall over the water butt and break her arm. Got out of A&E at 2 am The Scotland trip planed for September is now off.
Well, at least not photos of pets performing tricks, and unattractive and untalented grandchildren.
Monsieur clearly likes to Get Away From It All.
I myself trained on a Pentax Spotmatic SPII camera. Sadly prone to failure of the CdS light sensor.
Liken my nightly Nova-hunting sojourns onto the streets of Southsea to the famous Brassai in Paris:
You do not want to know what goes on in our streets at night. 😳
Monsieur clearly likes to Get Away From It All.
I myself trained on a Pentax Spotmatic SPII camera. Sadly prone to failure of the CdS light sensor.
Liken my nightly Nova-hunting sojourns onto the streets of Southsea to the famous Brassai in Paris:
You do not want to know what goes on in our streets at night. 😳
I'm sorry to hear about your wife's little accident.
Will she now be the "butt" of a joke among family and friends?
P.S. Thanks for the portfolio link.
Attachments
On our trip to Wales in May she got vertigo. It’s a bit of a family joke at the minute 🤣🤣🤣I'm sorry to hear about your wife's little accident.
Will she now be the "butt" of a joke among family and friends?
P.S. Thanks for the portfolio link.