Easy: make the charge percentage display relative to the maximum configured charge. Just like it already is with battery deterioration over time: if my battery only holds 80% of its design capacity, the phone will still tell me to be 100% charged as soon as the battery hits that 80%-of-design-capacity-brick-wall.
I just want the option to manually move that brick wall down a bit (they're already telling me exactly where it is right now, on iPhones at least, on the MacBook I ask coconutBattery).
If they do that after deliberately reducing their maximum charge (a setting which would probably come with a warning that reduced runtime of the phone is the result of doing it), they'll probably also complain that their internet speed has gone down after disabling the LTE/4G option (actually that does seem to be even less transparent, because not everyone knows that LTE is faster than 3G). Didn't stop Apple from offering a switch to disable LTE/4G.
I just want the option to manually move that brick wall down a bit (they're already telling me exactly where it is right now, on iPhones at least, on the MacBook I ask coconutBattery).