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What's the real reason that laptop batteries are made not-accessible?
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David Hess:

--- Quote from: IanB on December 07, 2021, 11:13:17 pm ---I far prefer to have devices that use AA or AAA rechargeable batteries, so I can simply swap or replace the battery when needed.
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I prefer AA and AAA cells also but have recently expanded my acceptable battery list to CR123A and rechargeable 18650s which are twice the length of CR123As.  Many 18650 devices can use a pair of CR123As instead if necessary.
james_s:

--- Quote from: NiHaoMike on December 08, 2021, 03:34:47 am ---The problem comes down to either you'll have to have fairly large coupling caps to allow the use of a single voltage rail or you'll have to add a negative rail to a device that otherwise would not need one. Then there's the issue that while it works well for headphones since they don't have any other connection to ground, using it to connect an amplifier is just asking for ground loops. Making a new consumer standard for differential analog audio with allowance for up to a few volts of common mode offset solves both those problems, but such a standard has few advantages compared to USB audio. Most higher end consumer amplifiers nowadays are digital so a digital interconnect makes a lot of sense.

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There is no problem, you're making a mountain out of a mole hill. The PAM8403 for example puts out several watts running from a single supply and requires only a few tiny chip capacitors and there are numerous other options. I don't know what amp is inside my iPhone SE but it works perfectly both to drive headphones and feeding an amplifier and it works perfectly in countless other phones, music players and other devices made over the years. This "problem" has been solved years ago, we don't need to reinvent the wheel.

I'm not against differential audio, but it isn't needed on a phone. I just want a standard headphone jack, like the one I already have on my phone, which is like the one I had on my last phone, and on my iPod, and on the dozens of other gadgets I've owned that had one. It's not like this is some hypothetical new invention, it's literally something I already have, have had for years, and would like to keep having.
tooki:

--- Quote from: SiliconWizard on December 07, 2021, 01:13:40 am ---Yeah. Batteries are held in place with this double sided stuff. Heck, most of the time, there's even a strip underneath that's supposed to make it easy to remove the double-sided tape and thus the battery. In practice, after a few months of use, with regular heating from the battery, the double-sided tape becomes almost impossible to remove this easily. So the strip is great for servicing batteries after just a short time of use - probably for phones still under warranty - but after 2 years or so, that becomes a lost cause and removing the battery almost always imply fighting with the adhesive and eventually butchering the battery, hoping you don't damage it enough for it to leak or something. Yes, done this a few times... :-DD

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I recently replaced the battery on my old iPhone 6S (from 2015) and the adhesive strip pulled off just as it was supposed to. If I’m not mistaken, I had had the battery replaced 2 or 3 years prior, so at the very youngest it was a 2 year old battery, but probably longer.
Miyuki:

--- Quote from: james_s on December 08, 2021, 06:25:05 am ---There is no problem, you're making a mountain out of a mole hill. The PAM8403 for example puts out several watts running from a single supply and requires only a few tiny chip capacitors and there are numerous other options. I don't know what amp is inside my iPhone SE but it works perfectly both to drive headphones and feeding an amplifier and it works perfectly in countless other phones, music players and other devices made over the years. This "problem" has been solved years ago, we don't need to reinvent the wheel.

I'm not against differential audio, but it isn't needed on a phone. I just want a standard headphone jack, like the one I already have on my phone, which is like the one I had on my last phone, and on my iPod, and on the dozens of other gadgets I've owned that had one. It's not like this is some hypothetical new invention, it's literally something I already have, have had for years, and would like to keep having.

--- End quote ---
And most phones have already that analog audio signal routed to the connector (either USB C or Lightning). It is just a matter of the shape of the plug on the headphones.
It is not a bigger problem than 6.3 mm jack vs 3.5 mm one and small 2.5 mm
When I really want to use big headphones with bulky cable is that connector reduction that big problem?  :-//
NiHaoMike:

--- Quote from: james_s on December 08, 2021, 06:25:05 am ---There is no problem, you're making a mountain out of a mole hill. The PAM8403 for example puts out several watts running from a single supply and requires only a few tiny chip capacitors and there are numerous other options. I don't know what amp is inside my iPhone SE but it works perfectly both to drive headphones and feeding an amplifier and it works perfectly in countless other phones, music players and other devices made over the years. This "problem" has been solved years ago, we don't need to reinvent the wheel.

--- End quote ---
PAM8403 is differential output and will not work for driving headphones. There's no way around coupling capacitors or a negative supply rail with that antiquated design.

I recall that back when the iPod was popular, the output capacitors were too small causing substantial waveform distortion at lower frequencies. Hence the emergence of portable headphone amplifiers, something that really shouldn't be needed for a device specifically designed for portable audio.

--- Quote from: Miyuki on December 08, 2021, 08:43:47 am ---When I really want to use big headphones with bulky cable is that connector reduction that big problem?  :-//

--- End quote ---
As mentioned, USB-C gives extra capabilities like using the headphones to hold extra battery capacity for a portable device that's made thinner than it needs to be.
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