ghyrpejsekieddrjiljhy wrote:
On 6/24/2018 3:17 AM, NY wrote:

Is there anything I should be doing differently so the battery won't
die after a couple of years?

My phone came with a turbo charger that will fully charge my depleted
battery in an hour or so. I've often wondered the same thing. Should I
use a standard charger to save on battery life because it seemed to me
the fast charge would add extra stress to the battery? I settled on
using the standard charger overnight and the turbo charger when I needed
the quick charge. Then I read that overnight charging is bad. So I tried
wireless charging but then the phone became very hot so that seemed bad
also. Can't win.

Bottom line: I said screw it and just used whatever was convenient. The
battery is now 2 years old and I notice no difference from when it was
new... :-/

http://batteryuniversity.com/learn/a..._ion_batteries

"Increasing the charge current does not hasten the *full-charge* state
by much. Although the battery reaches the voltage peak quicker, the
saturation charge will take longer accordingly. With higher current,
Stage 1 is shorter but the saturation during Stage 2 will take longer.

A high current charge will, however, quickly fill the battery to about
70 percent.
"

http://batteryuniversity.com/learn/

See the graph on this page, for what turbo charging is doing to the battery.
There's some apparent capacity loss from the abuse.

http://batteryuniversity.com/learn/a..._fast_chargers

*******

Not all battery chemistries or designs, tolerate turbo charging.
For example, the 5 amp hour and 8 amp hour NiCd D cell batteries,
they only charge at C/10 and take ten to sixteen hours. I
learned this, by actually downloading a datasheet for one
such product. And the info is in the datasheet, as to what
charging modes are acceptable. The slow charging rate,
makes determining the end-point harder for that chemistry.

In the case of Lithium, they seem to use a simple voltage
threshold, to detect end of Stage 1. This simplifies charger
chip design a lot. Other battery chemistries use dV/dt, and
if the cell voltage drops for a minute or two, after
gradually rising for a number of hours, that's a sign to the
battery charger, that the cell is full. If you set the
constant current charging level to a low value, it makes
it difficult to detect the "end point" - the dV/dt "bump"
is too small and is lost in the measurement noise. So if you
were contemplating designing your own battery charger for a
large NiCd, you have to charge it fast enough so you
can precisely stop charging it. Using dV/dt and noticing
the voltage effect caused by cell pressure. Some
battery chemistries could have benefited from an
actual pressure sensor inserted inside the battery,
but like "belt and suspenders", if the pressure sensor
failed, you still need an electronic charge termination
scheme as a backup. So nothing is gained, in a cost-sensitive
world.

On some chemistries, there are thermal effects, pressure
effects, dV/dt, and some chargers for example, actually
have a thermistor to detect the temperature rise
near the end of the charge cycle. Like an autonomous
vehicle with "sensor fusion", a well designed charger
can observe multiple parameters, in an effort to
detect failures in the charging scheme. (If you miss
dV/dt, the temp rise can tell you to "stop what you're doing".)

Paul