Quickcharge without quickcharger or battery support?

[Sybaris Caesar]

Don't know if to categorize this as technical problem or feedback or something. My mobile's Samsung Galaxy S 2 Plus GT-i910P. From what I gather this 2013-something phone doesn't have the recent quickcharge support nor I have the charger for this feature. Just standard 5v-.7a charger. But recently I've noticed that if I charge thr phone in its >20% and restart the phone, the charge just jumps to more than 50%. Quickcharge for free? Or is it display/battery read problem? BTW the more than 50% doesn't dip unnaturally just after a heavy load (not a display problem?). The phone's battery drains at normal rate. any thoughts? BTW android is stock (samsung stock) 4.2.2 jelly bean and the phone is rooted.
@redwan hasan , @Swapnil or someone?

[Sybaris Caesar]

Reading fault. Often caused by high wear of battery.

but like I said, I've stress tested it with games and soft tested with hours of internet browsing.

[redwan hasan]

Don't know if to categorize this as technical problem or feedback or something. My mobile's Samsung Galaxy S 2 Plus GT-i910P. From what I gather this 2013-something phone doesn't have the recent quickcharge support nor I have the charger for this feature. Just standard 5v-.7a charger. But recently I've noticed that if I charge thr phone in its >20% and restart the phone, the charge just jumps to more than 50%. Quickcharge for free? Or is it display/battery read problem? BTW the more than 50% doesn't dip unnaturally just after a heavy load (not a display problem?). The phone's battery drains at normal rate. any thoughts? BTW android is stock (samsung stock) 4.2.2 jelly bean and the phone is rooted.
@redwan hasan , @Swapnil or someone?

My mom's phone has same type of issue,goes to 10% from 50% directly, negative Quick Charge I assume. Anyway on a serious note, most probably a reading issue, and do you remember how much time it needed to charge it to 50% before this? If it takes the same time to charge up to 20% that means the battery was actually charged up to 50% but wasn't showing it, and as far as I know they use to measure how much charge has gone into the battery or out of the battery to measure the battery percentage so there could be a fault in that measurement.

Have you installed anything lately?

[minitt]

Reading fault. Often caused by high wear of battery.

thats the most likely reason. @Sybaris Caesar if u get more usage nowadays from your phone than a year ago, then talk to nasa/Lockheed martin because u have a gifted battery that defies the fundamentals of physics and chemistry.

as for free quickcharge, well it needs separate voltage regulators that can initiate and intake higher voltage from the quick charger.

so for quickcharge u need a phone with builtin HW support + Quick charger

[Sybaris Caesar]

yeah looks likw reading issue. the battery percentage drops to 10-12 after reaching 25 it seems but damn, 54-25 lasts upto 1.5 hours!

[Swapnil]

Your sensor needs re-calibration. Don't know how to do it in Samsung, but in Motorola's manual the instruction was like this: Get the phone fully discharged by using it, and then charge it 100% in one go. And when charging it to 100%, don't use the phone, keep the display off and airplane mode on after it reaches 90%.

[minitt]

But while roaming around on the internet, I saw somewhere that discharging a li-on battery totally is the sure way of killing it!!
dunno if it is applicable to the notebooks batteries only or not, but where it comes to chemistry I think it should be.

completely depleting a battery and then keeping it empty for a while will negatively impact any battery you can think of.