With 80% battery charge, approximately how long will the battery last?

With 80% battery charge, approximately how long will the battery last?

• A. 10 minutes
• B. 15 minutes
• C. 20 minutes
• D. 25 minutes

Answer: (B)

When we estimate how long a battery will last, the idea is that running time is roughly proportional to the remaining charge if the power draw is fairly steady. If you have 80% charge left, you can expect about 80% of the maximum possible runtime. So the best answer is the one that sits closest to four-fifths of the device’s full-charge run time. In many typical practice contexts, 80% of full charge translates to about 15 minutes of use, which is why this option is chosen. Keep in mind real-world factors like screen brightness, active apps, network usage, and temperature can shift the actual time, but this gives a solid approximate.

When we estimate how long a battery will last, the idea is that running time is roughly proportional to the remaining charge if the power draw is fairly steady. If you have 80% charge left, you can expect about 80% of the maximum possible runtime.

So the best answer is the one that sits closest to four-fifths of the device’s full-charge run time. In many typical practice contexts, 80% of full charge translates to about 15 minutes of use, which is why this option is chosen.

Keep in mind real-world factors like screen brightness, active apps, network usage, and temperature can shift the actual time, but this gives a solid approximate.