Here are several reasons why "percent remaining" is a useful statistic: 
--Power consumption varies, making "time remaining" less accurate. Yes, if we 
can improve the estimate, then by all means, we should do so, but that doesn't 
change the fact that percent remaining is more precise and accurate. It can 
also be more useful when the user is going to switch to a different sort of 
task, as it will drain the battery at a different rate. 
--The battery percentage is FAR more important to users who are concerned about 
managing battery health. 
===Batteries have to be stored at the proper charge level (which is impossible 
to deduce from "time remaining" since as the battery's overall capacity 
decreases, this statistic will change, while the percentage will not). 
===To maintain battery health, it is necessary to start charging the battery at 
a particular percentage (for batteries where "memory" is an issue, a full 
discharge is recommended. For Lithium ion batteries, which are the standard for 
laptops, it's around 10-20 percent).
--Some users prefer "percent remaining (to charge)" to "time remaining (to 
charge)." When possible, good interfaces accommodate user preference. This 
alone is sufficient reason to give the user more options. 

The current design makes this statistic less accessible and limits user choice. 
 Currently, when you click on the battery icon, it displays the time remaining 
(time to charge), gives you the option of putting this info in the menu bar, 
and does NOT display the percentage. This is a poor design because: 
it decreases user control over what statistics are being displayed (giving the 
user options is BETTER)
it makes the other statistic (percent remaining) harder to find. One has to 
either look at battery statistics (which doesn't display percentage when 
battery is charging), power system settings, or use the terminal.
Additionally, both statistics are most useful when used in conjunction with the 
other, so user experience can be improved by making both accessible regardless 
of preference.

A better design is to give the user the option to display EITHER the
time remaining OR the percentage, and displaying the other statistic
when you click on the battery icon. This would increase customization
make both statistics accessible, resulting in a better user experience.

** Summary changed:

- "Show Percentage Remaining" is more useful than "Show Time Remaining"
+ Battery meter design needs to make percentage and time statistics easily 
accessible.

** Summary changed:

- Battery meter design needs to make percentage and time statistics easily 
accessible.
+ Battery meter design needs to make both percentage and time statistics easily 
accessible.

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https://bugs.launchpad.net/bugs/811777

Title:
  Battery meter design needs to make both percentage and time statistics
  easily accessible.

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