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CPU running at max speed requires a lot of power. Degraded batteries have a higher internal resistance, which lowers the amount of power they can provide. So wh

CPU running at max speed requires a lot of power. Degraded batteries have a higher internal resistance, which lowers the amount of power they can provide. So when the CPU draws a lot of power, the voltage on the battery drops. If the voltage drops to low, the battery protection circuit will shut it off. What people here don’t seem to understand is that capacity, battery health, and max power output are related. Old batteries just can’t provide the current that the phone needs. Battery replacements are cheap, and when your battery is degraded you should just swap it. Consumer protection laws won’t help you here. Apple is not pretending to sell a phone that doesn’t need service; on the contrary, they even strongly advertise their “protection plan” that would cover degraded batteries.

GordonS 9y ago
I think the biggest issue here is that your phone will do this silently. I think a better solution would be to notify the user and ask them if they want to go into the reduced power mode. I have an S7, and when the battery level gets really low it does exactly that (although it can actually take it even further if you want, switching off the radio, making the display monochrome etc).
- jakobegger 9y ago
  Low power mode is something different, and iOS has that too. The problem here isn't that iOS isn't just trying to conserve power to last a bit longer. At some point the battery physically can't deliver the current required to run the CPU at max speed. At that point, the phone battery settings screen says something like "Battery Service Required". For some reason a lot of people get annoyed when their phone needs service. It's understandable, but I really don't see what Apple should do about it. When a car's battery needs to be replaced, people don't go complaining how their car is suffering from planned obsolescence, they just replace the battery.
  - GordonS 9y ago
    > they just replace the battery Is it even possible to replace an iPhone's battery though? I would guess if Apple offered battery replacement as a service, at a reasonable price (not very Apple-like, I know!), people would use it.
    - jakobegger 9y ago
      Apple offers iPhone battery replacement for around $80, third party repair shops will do it for $30, and if you do it yourself you can order a kit (battery+required tools) on Ali Express for under $10

GordonS 9y ago

I think the biggest issue here is that your phone will do this silently. I think a better solution would be to notify the user and ask them if they want to go into the reduced power mode. I have an S7, and when the battery level gets really low it does exactly that (although it can actually take it even further if you want, switching off the radio, making the display monochrome etc).

jakobegger 9y ago
Low power mode is something different, and iOS has that too. The problem here isn't that iOS isn't just trying to conserve power to last a bit longer. At some point the battery physically can't deliver the current required to run the CPU at max speed. At that point, the phone battery settings screen says something like "Battery Service Required". For some reason a lot of people get annoyed when their phone needs service. It's understandable, but I really don't see what Apple should do about it. When a car's battery needs to be replaced, people don't go complaining how their car is suffering from planned obsolescence, they just replace the battery.
- GordonS 9y ago
  > they just replace the battery Is it even possible to replace an iPhone's battery though? I would guess if Apple offered battery replacement as a service, at a reasonable price (not very Apple-like, I know!), people would use it.
  - jakobegger 9y ago
    Apple offers iPhone battery replacement for around $80, third party repair shops will do it for $30, and if you do it yourself you can order a kit (battery+required tools) on Ali Express for under $10