Battery charge within boundaries

[rockinghawk]

Hi, please find below an app idea/need description for your consideration.

Many of us have more than one SIMs that we want to check but do not want to always have 2 phones with us all the time. Hence, the secondary phone stays home to check for missed calls and messages.

This requires either to manually charge the phone with intervals, a burden and risk of forgetting to do so and the phone shuts down; or leave it on the charger all the time which will eventually kill the battery quite soon.

From the above arises the need for an app that manages the charging within predefined boundaries: i.e. start charging only when the battery drops to 10% and stop charging at 100%. This ensures that the phone never switches off and saves the battery while it is continuously connected to the charger.

Thank you!

 

[Rukbat]

or leave it on the charger all the time which will eventually kill the battery quite soon.

No it won't. The phone has a charging circuit in it (the 5 Volt charger isn't just directly connected to the 3.75 Volt battery to charge it), which shuts charging off when the battery is fully charged. As soon as the battery gets used a bit (different amounts in different phones, but less than 1%), the charger kicks in again and tops the battery off. (Cellphone-connected burglar alarms work like that - the phone battery is connected to the charger at all times power is available - and if the house is broken into 2 years later, when there's a power failure, the battery is still good.)

 

[rockinghawk]

No it won't. The phone has a charging circuit in it (the 5 Volt charger isn't just directly connected to the 3.75 Volt battery to charge it), which shuts charging off when the battery is fully charged. As soon as the battery gets used a bit (different amounts in different phones, but less than 1%), the charger kicks in again and tops the battery off. (Cellphone-connected burglar alarms work like that - the phone battery is connected to the charger at all times power is available - and if the house is broken into 2 years later, when there's a power failure, the battery is still good.)

I know it stops charging when full, the battery though is killed slowly when recharged all the time at 99% and the same applies for alarms; their batteries need replacement due to this at some point. Maybe killed is not correct, but their longetivity is severely affected. It is better for batteries to be charged from much much lower than 99%

Your suggestion to leave it in the charger will make the phone use up its battery quite fast when one dayyou take it off the charger

In summary, for a healthy battery you should discharge it a bit and then recharge, remaining at around 30-80%. Same with laptops that if left on adapter all the time, in the longterm their battery does not last long.

 

[deathslocus]

I think this is a good idea PM so we can talk about it

 

[rockinghawk]

PM'd the interested member but did not follow through.. Anyone else like the idea?

 

[DroidVish]

If this app is developed, whats the next step?
1. Is it for personal use?
2. You plan to release it as a app for commercial gains?
PM me, we can discuss more

 

[DanielDev]

I like this idea. I would like to add this feature to my app Battery Temperature Guard. https://play.google.com/store/apps/details?id=src.schimi.temperatureguardfree

But I am not quite sure how to stop charging when the charger is still plugged in. Anyone got an idea?

 

[Mysticfever]

Have the app set up to when the phone hits 100% battery charged disable the charging port driver. And around 5% battery life re-enable the driver and restart the phone. Rinse and repeat?

 

[sohguanh]

When we write apps, we write against the Android API provide to us. Logic like "disable the charging port driver" can only be done when there is a API for us to call and use. If there isn't what most apps do is dig under the covers of Android OS to see how it is done and work "illegally" to give users what they want.

Then Android release a new version that change the internals and viola, the previous app stop functioning unless that developer do catching up once again.

Sorry for being too technical but I am trying to portray perspective from a developer point of view. Hopefully users can understand why certain tasks aren't out or even they are out, they access illegal Android OS API.

 

[rockinghawk]

Thank you all for the replies, so is this idea dead since it could be considered as 'illegal' or can we proceed?

 

[BLuFeNiX]

It is possible, but anyone who wants to use the app will need a rooted phone.