+21%
battery drain from third-party scripts on mobile
Controlled tests show that loading ad-supported pages without a blocker increases battery drain by around 21% versus the same pages with trackers removed.
Context
Most of the cost is JavaScript execution, not raw radio time; CPU work to render ads, auction them and report telemetry is the dominant factor.
Key takeaways
- Battery savings from blocking are mostly CPU-bound, not network-bound.
- Phones with smaller batteries (e.g. compact iPhones) see proportionally larger gains.
Sources
- Mozilla Battery Impact study (2023)
Cite this statistic
NovaBlock (2026). "+21% — battery drain from third-party scripts on mobile." Retrieved from https://novablock.app/statistics/battery-impact-tracking