Battery Ranking
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How the ranking works

Samsung Galaxy A71, today

Sessions

Pooled rate

Percentile

Weighted

Score

Screen on374
−13.1pts/h
59.4
×0.6035.6
Screen off356
−3.32pts/h
32.5
×0.258.1
Charging326
+18.8pts/h
41.7
×0.156.3
blend50.0

all blendspercentile

50.1

rank 572 of 1,146

Where the numbers come from

Android apps that include the Battery Ranking library contribute battery sessions: unbroken stretches of discharging or charging. Each phone model’s sessions add up to running totals of points and hours.

Three measures

00:0006:0012:0018:0024:000%50%100% screen off: slow, steady screen on: steep charging: climbing
Illustration, not a real phone.
Screen on
Points lost per hour, screen on, unplugged.
Screen off
Points lost per hour, screen off, unplugged.
Charging
Points gained per hour on the charger.

Pooled rates

Per model and measure: total points divided by total hours.

Session A6 points in 30 minSession B28 points in 4 h on its own: 12 an hour on its own: 7 an hour Pooled34 points in 4 h 30 min 34 ÷ 4.5 h = 7.56 points an hour
Two invented sessions. Bar length is time.

Today’s medians: 14.2 points an hour lost with the screen on, 2.57 with it off, 20.9 gained on the charger.

Enough evidence

Each model needsScreen onScreen offCharging
Sessions, at least555
Observed time, in total2 hours8 hours15 minutes
Battery movement, in total10 points2 points10 points

The ranking starts once at least 5 models qualify.

Percentiles

Per measure, a model’s percentile is the share of the other models it beats. Lower drain and faster charging rank higher. Ties share the middle.

16.814.913.212.111.411.49.88.77.96.65.2 050100 %/h beats 7 of the other 10, so its percentile is 70 a tie shares the middle: both get 45
Eleven invented phones, worst screen-on drain on the left.

The blend

Fixed weights: screen on 60%, screen off 25%, charging 15%.

Screen on59.4 × 0.60 = 35.63Screen off32.5 × 0.25 = 8.12Charging41.7 × 0.15 = 6.26blend 50.02
Samsung Galaxy A71, today. Bar length is the percentile, height the weight.

The score

The score is the blend’s percentile among all ranked models, worked out as for each measure. Equal scores share a rank.

Samsung Galaxy A71: blend 50.02, score 50.1, rank 572 of 1,146.

Limits

  • Not a lab test.
  • A model’s figure, not your phone’s.
  • Hours are estimates. Straight lines from pooled rates, so read “≈ 7 h 05 min” as “about”.
  • Sessions aren’t people. One phone contributes many sessions.
  • No error bars. Each phone page lists its session counts.