# How estimates are calculated

Submitted by 3c on Fri, 05/13/2011 - 09:13

Forums:

**1. Global Estimation**

This is the weighted average between #2 and #3 below.

**2. using all-time average**

This is based on average times of AC, USB and unplugged cycles.

**3. using average since (un)plug**

This is based on last measures

**4. using battery (dis)charge**

This is based on current mA charge/discharge and remaining battery capacity (mAh).

Let's consider the following situation:

- Current battery level is 90%
- Last measure shows 100%, 10 minutes ago (1% per minute)
- Average discharge time (100->0%) is 20 hours (5% per hour)
- Current mA = 50mA and mAh = 1350 (full=1500mAh)

This results in the following figures:

- 10% 1h30m + 90% 18h = 16h21m
- 90% to go at 5% per hour = 18 hours
- 90% to go at 1% per minute = 1 hour 30 minutes
- 1350 mAh / 50 mA = 27 hours

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## Another perspective on the calculation

When you use your phone as an usual day, you can estimates the time remaining based on previous usage, eg the average time from 100% to 0% that was previously recorded.

That's the

all-time averageestimate.Now let's say you've unplugged fully charged and your using the phone from time to time in a regular way, you can then estimates the remaining time on battery from the usage since unplugging the phone.

That's the

since-unplugged averageestimate.But now, let's say you're starting to play a 3D game and it's consuming a lot, you can estimates the remaining time playing this game using battery consumption (mA).

That's the

battery drainestimate.So now, the

global estimate isthe weighted-average betweenall-timeandsince-unpluggedestimates. The weight is the actual %-based.The closer to 100% the more global estimate is close to all-time average. The closer to 0% the more global estimate is close since-unplugged average.

3c@3c71.com## Bottom mV = 3200 is good

That's the minimum voltage most battery will accept before considering it's empty.

Did you enable the '% based on mV' in the monitoring settings? If not the % you read are provided by Android. If you have this option on, it will only help about measring the real 0%.

As for the 'about to die', it's not an app alert, but an Android alert based on the % reported by Android, which is the default you can see in the app when above option is off.

3c@3c71.com