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Redmi Note 9/S/Pro

[Tips] How to extend battery life in your Phone

2020-10-16 07:11:55
465 16
Any li-ion/li-poli lithium powered device should follow this charge pattern if you wish to extend the battery lifespan.

Basically what University papers published:

***Charge from 25% up to 85% and keep it that way. No more No less***


Do not / leave your phone charging overnight / past 85% / do not keep it always at 100% / going lower than 25% / always use official charger that came with your phone / avoid Fast Charge unless extreme necessary / do not Game or Social Media when charging just power off phone and charge.



So if your brand new phone battery was supposed to last 1 year. With this pattern you will extend double in time, that is 2 years.

Source:

https://batteryuniversity.com/index.php/learn/article/how_to_prolong_lithium_based_batteries

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2020-10-16 07:11:55
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It is safe (for your battery life) to leave your phone charging overnight, as when the battery is charged PMIC prevents to keep recharging overnight.

You can also use your smartphone while it is charging: PMIC charges your battery AND provides also power supply to your smartphone
2020-10-19 18:54:36

Semi Pro Bunny

digitalnomada Author | from Redmi Note 9 Pro

#2

As university papers published. It may cut off energy when full 100 but that state of charge decays over the hours of your sleep so it needs to pump tickle to keep it at 100 and thats a killer. Also when charging just power off the phone you control your life not the other way around and variable voltage kills it fast, because while you are using it you drain energy and the controllers keeps pumping more voltage than needed to surpass your energy needs hence killing battery faster due to heat and higher voltage.
2020-10-19 19:06:28
digitalnomada replied at 2020-10-19 13:06:28
As university papers published. It may cut off energy when full 100 but that state of charge decays over the hours of your sleep so it needs to pump tickle to keep it at 100 and thats a killer. Also when charging just power off the phone you control your life not the other way around and variable voltage kills it fast, because while you are using it you drain energy and the controllers keeps pumping more voltage than needed to surpass your energy needs hence killing battery faster due to heat and higher voltage.

Nowadays a PMIC can handle both security timer and power path.

Security timer prevents to recharge the battery again until this timer expires (or main power supply is removed). Usually this interval is at least to 10-12h.

Power path instead manages battery and external power supply, so if a power supply is connected there is no battery drain: power supply will charge the battery (if needed) and will power also your smartphone.
2020-10-21 05:18:51
certainly not, do your study refuting the paper of those professional group of engineers at university then, i doubt it xD
2020-11-09 01:38:12

Pro Bunny

Simone-it | from Redmi Note 9 Pro

#5

digitalnomada
certainly not, do your study refuting the paper of those professional group of engineers at university then, i doubt it xD

It's not my study, it's how a PMIC in 2020 works
2020-11-09 06:03:02
So the safest method after reading the debate of digitalnomada and Simone-it .....will be still to follow what is said in the original post.
2020-11-10 02:19:15
But what about a brand new device right out of the box, should we use until dead after very first power on of the device and to charge to 100% without using the device in its very first charge cycle and thereafter use the procedure of charging again when at 25% and until 85% is reached?

2020-11-10 02:23:58
6375526877 replied at 2020-11-09 15:19:15
So the safest method after reading the debate of digitalnomada and Simone-it .....will be still to follow what is said in the original post.

of course man, engineers and scientists professionals did the study and published paper..
2020-11-10 04:09:48
6375526877 replied at 2020-11-09 15:23:58
But what about a brand new device right out of the box, should we use until dead after very first power on of the device and to charge to 100% without using the device in its very first charge cycle and thereafter use the procedure of charging again when at 25% and until 85% is reached?

li-on / li-po lithium batterys are NOT memory battery, they function different, always do the  25%85% they are happy in that state of charge and you dont need to top your device to get good ScreenOnTime Hours,  i get 13/15hs depending on brightness and use. Do Not let it gow undercharge below under 25% thats bad really bad for the battery, **small charges are fine** like you are in 40% and charge up to 60% or  80/85% (accubattery app notify you but i dont use it for it is another app consuming battery xD and thats unlogical) if you have the time (which is just a few minutes) Even Samsung high end devices/Apple  have implemented a feature in their phones to notify the user when battery is up to 80/85% and disconnect from wall socket/charger. So yeah, do not charge overnight phones they will die.The problem is Heat (gaming on phones thats a no no), high/low voltage (Fast chargers kills battery faster), temperature, charging and at the same time playing/using phone. if you follow this pattern of use, you wil achieve minimum 2/3 years lifespan (versus less than 1 year heavy use/gaming phone) with healthy battery retain charge, that will give you time to buy new phone in 2/3 years.
2020-11-10 04:13:16
6375526877 replied at 2020-11-09 19:19:15
So the safest method after reading the debate of digitalnomada and Simone-it .....will be still to follow what is said in the original post.

Of course anyone is free to do anything he likes with his device, but the algorithm of any battery management IC in 2020 is more complex than just "usb connected = charging battery".

I will share as an example a datasheet of a battery charger IC from Maxim https://datasheets.maximintegrated.com/en/ds/MAX77960-MAX77961.pdf

You can find the charger state diagram on page 33 and description about Done state on page 36:

In the done state, the battery charging current (ICHG) is 0A and the charger presents a very low load (IMBDN) to the battery. If the system load presented to the battery is low ( 100μA), then a typical system can remain in the done state for many days


So in done state battery is not charged (ICHG=0A). System load presented to the battery is low when external power supply is still connected, so the device is powered by external power supply through the PMIC. In this case the system can remain in the done state for many days.

Every manufacturer implements their own algorithm, for example TI uses a safety timer or watchdog timer to prevent abnormal charges or cycles.
You can't find many details about qualcomm PMICs as most of the documentation is under NDA and available only to developers, anyway, even on the original article posted you can find this:

The question is asked, “Should I disconnect my laptop from the power grid when not in use?” Under normal circumstances this should not be necessary because charging stops when the Li-ion battery is full. A topping charge is only applied when the battery voltage drops to a certain level. Most users do not remove the AC power, and this practice is safe.
So, yes, again it is safe to keep charger connected


2020-11-11 06:40:17
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digitalnomada

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