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talk time on the OEM batt is 3.5 hours (210 minutes) or so.
You talked for 17% of that time
Your battery shows 20% gone
Close enough, esp if you used a BT headset.
If you're in a car, a $6 USB/Cig ligher adapter can be used to power the phone off the included USB cable while driving. Or, you can get yourself a fat extended battery.
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