My cellphone shows how full the battery is with a little picture of a battery containing four or five little bars. I have a pretty good battery - when I'm down to just one bar, it can last a couple of days. But if I have a non-standard day coming up, some situation where it's more important than usual to be able to make and receive cellphone calls, I start feeling tempted to recharge when the phone is down to one bar. This is a problem - my previous phone died because I didn't let it empty all the way before recharging and left it on the charger too long when I did recharge, so I want to be particularly careful not to recharge a non-empty battery unless absolutely necessary.
This is why I want my phone to tell me how much battery time is left. Just make it a function in the menu. Tell me how much "on" time and how much "talk" time is left. Better yet, let me enter a value for "talk" time, and tell me how much "on" time I have in addition to that. That way, if I know that tomorrow I'll need to have the phone on for four straight hours and anticipate making six five-minute calls during that time, I can calculate whether I'll need to recharge the phone tonight or not.
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