In regards to the 5 minute drop from 100% to 90%:
First of all, the phone is reporting the battery correctly. For sanity purposes most Lithium Ion battery software monitors will round down to prevent a full discharge which causes the cells to be permanently damaged.
Secondly. Is this your first smart phone? Seriously the last two I've had report battery in 10% increments. Its just something you have to get used to. Yeah. Your phone says 100% battery power for about 5 minutes. but it says 90% battery power (actually between 90% and 99%) for a few hours.
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