Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old October 10th 18, 08:02 PM posted to alt.home.repair,sci.electronics.repair
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Default Why is this, charging and using battery pack at the same time.


Why is this, charging and using battery pack at the same time.

3 out of 4 answers say it's bad. Why? or why not?

https://www.amazon.com/ask/questions...dp_dpmw_al_hza

And what is "PD capable".

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Old October 12th 18, 12:16 AM posted to alt.home.repair,sci.electronics.repair
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Default Why is this, charging and using battery pack at the same time.

On 10/10/18 20:02, micky wrote:

Why is this, charging and using battery pack at the same time.

3 out of 4 answers say it's bad. Why? or why not?

https://www.amazon.com/ask/questions...dp_dpmw_al_hza

And what is "PD capable".


USB Power Delivery
https://www.androidauthority.com/usb...livery-806266/

--
Adrian C
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Old October 12th 18, 01:16 PM posted to sci.electronics.repair
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Default Why is this, charging and using battery pack at the same time.

"3 out of 4 answers say it's bad. Why? or why not?"

For one because if you blow the fusible on the mobo to the USB power I will charge you fifty bucks to replace it, more if it is a laptop.

The thing here that batteries charge at a much higher rate than they used to. The old NiCds would charge slowly, at a low current rate, generally you had to charge longer than you could run. But newer battery technology has them charging at a much faster rate which requires more current, making that current drain significant.

Say, in the old days (yeah right) a batteryu might charge at 75 mA and the device needs 900 mA to run. The 75 is less than 10 %, not a big thing. But by the laws of physics (thermodynamics believe it or not) if the battery charges in say 2o minutes and will run an hour on that charge, the charging current must be 3 X the drain current. A battery, except for dry cells and that weirdo machine that suck magnetism out of PMs, is noting but a storage device like an electrolytic capacitor. In fact the operation is replete with similarities.

Let me try to draw this; (I suck at it)

Power - \ --- device
...........--- current regulator/logic --- battery

The "bottom line" there used to be insignificant, but now it can actually be MORE than the device pulls to run. A USB port might not be able to handle it.
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Old October 12th 18, 04:00 PM posted to sci.electronics.repair
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Default Why is this, charging and using battery pack at the same time.

On Wed, 10 Oct 2018 15:02:48 -0400, micky
wrote:


Why is this, charging and using battery pack at the same time.

3 out of 4 answers say it's bad. Why? or why not?


I have never had a problem with simultaneous charging and use any
electronic device. I've worked on a variety of electronic systems all
my life and I'm now 70. There are many very common devices that charge
and use a battery at the same time. Cars, telephones and PCs for
example.

Steve
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Old October 12th 18, 04:15 PM posted to alt.home.repair,sci.electronics.repair
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Default Why is this, charging and using battery pack at the same time.

Why is there an alternator in a car ?

It is charging when the battery is on also !

This is designed for compensating power loss and power gain ; there must
be a controller IC to compute everything.

micky a √©crit¬*:

Why is this, charging and using battery pack at the same time.

3 out of 4 answers say it's bad. Why? or why not?

https://www.amazon.com/ask/questions...dp_dpmw_al_hza

And what is "PD capable".




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Old October 12th 18, 08:14 PM posted to sci.electronics.repair
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Default Why is this, charging and using battery pack at the same time.

On Friday, October 12, 2018 at 11:15:44 AM UTC-4, Look165 wrote:
Why is there an alternator in a car ?

It is charging when the battery is on also !


Even back in the days of generators and voltage regulators the size of coffee cans.

Peter Wieck
Melrose Park, PA


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