Credit: Ryan Haines / Android AuthorityTL;DRThe average battery capacity of a smartphone was 5,291mAh in January 2026, according to a new report.This was the biggest yearly increase since December 2021.The increase has been attributed to manufacturers offering bigger batteries as well as the prevalence of silicon-carbon batteries.HONOR was the first major smartphone brand to embrace silicon-carbon batteries, and the likes of Xiaomi, OPPO, OnePlus, and vivo quickly followed suit. This has led to phones with gigantic battery capacities. So is it any surprise that the average battery capacity of a smartphone has apparently exploded this year?Counterpoint Research reported that the average battery capacity of a smartphone reached 5,291mAh in January 2026. That’s a 400mAh year-on-year increase and reportedly makes it the biggest yearly increase since December 2021. This also means that the average phone’s battery capacity in 2026 is now larger than the Galaxy S26 Ultra’s 5,000mAh battery.