Question

After about 1,000 charges, smartphone batteries lose about one-fifth of their charging capacity. A brand new phone is currently at 78%. What would this phone's battery percentage show after 1,000 charging cycles? (round to the nearest whole number)

Answer 1

After 1,000 charging cycles, the phone's battery capacity would be reduced by one-fifth of its initial capacity, which is 78% * (1 - 1/5) = 78% * (4/5) = 62.4%. Rounding this to the nearest whole number, the phone's battery percentage would show 62%.