You've likely noticed that we're having to charge our phones more often, despite steady advances in battery technology. The reason is that we're using the handsets that much more. Blame smartphones with their Web browsing, texting and navigation.
Battery capacity has grown about 4 percent a year, report analysts at Strategy Analytics. That isn't enough to keep up with the added demands. The time that we can go without charging will shrink about 5 percent a year between now and 2015.
Do the math: That means a phone that now can handle ten hours of heavy use won't make it seven hours. Faster charging will ease the pain, but we'll still need to find an outlet.