Android: API to control battery protection mode?

AI Thread Summary
Lenovo tablets feature a "battery protection mode" that optimizes battery life by charging and discharging between 40% and 60%, ideal for devices left on charge continuously. Currently, there is no public API to enable or disable this mode, as Android battery-related APIs are primarily read-only. Rooted devices may access this functionality through specific Magisk modules, while some OEMs might have hidden APIs, though these vary by brand and are not easily accessible. Different manufacturers implement various charging controls; for instance, newer Samsung devices can stop charging at 85% and resume at 83%. A potential product idea discussed is an external USB-C charger that could adjust charging profiles based on the device's state. Additionally, using a WiFi-controlled smart mains socket is suggested as an alternative method for managing charging through an app.
Swamp Thing
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My new Lenovo tablet has a "battery protection mode". This is useful for example when you want to leave it on charge almost permanently, in which case the protection mode will charge and discharge between 40% and 60% in order to maximize battery life.

Is there an API that can enable/disable this mode?

Screenshot_2022-06-25-07-59-26-516.jpeg
 
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As far as I know, there is no public API for this. All Android APIs related to battery are read-only.

If your phone is rooted, then there are some Magisk modules that can do this. In addition, OEMs may have some hidden APIs that can do this, but that will be specific to each brand and not easily discoverable.

Different brands have different implementations of charge controller. Your device charges and discharges between 40 and 60%. Newer Samsung devices with OneUI can stop the charging at 85%, and restart it at around 83%. (My HP laptop stops charging at 80% and trickle charges thereafter.)
 
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Swamp Thing said:
My new Lenovo tablet has a "battery protection mode". This is useful for example when you want to leave it on charge almost permanently, in which case the protection mode will charge and discharge between 40% and 60% in order to maximize battery life.

Is there an API that can enable/disable this mode?

View attachment 303294
Sounds like a new product opportunity to me. Design an external USB-C charging device that can query the charge state of the target device and adjust the charging profile delivered by that charging device. Might be a hit product -- I'd probably buy one or five... :smile:
 
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berkeman said:
Sounds like a new product opportunity to me. Design an external USB-C charging device that can query the charge state of the target device and adjust the charging profile delivered by that charging device. Might be a hit product -- I'd probably buy one or five... :smile:
While searching on this topic, I found a suggestion that one can use if one is OK with an extra external device. You can use a WiFi controlled smart mains socket that can be commanded ON / OFF by an app running on your phone. Charge through that socket, and let the app do all the logic.
 
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