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Feb27-12, 12:06 AM
P: 21,284
Quote Quote by moonman239 View Post
I have a phone. Since it was last charged, I used it for 8 hours and it was on standby for 16. Now my battery's down to 50%. How much battery did I use when I used the phone?

I'm thinking it's as simple as x + 2x = 50%.
Maybe or maybe not. You're assuming that the battery draw is the same when the phone is in use versus when it's in standby mode. It's possible and maybe likely that the phone uses less power when it's in standby mode, since it might not need to use power to drive the screen. If so, your equation doesn't take this reduced current draw into account.