The Galaxy Note 9 features a 4,000 mAh non-removable Li-Ion (or Li-Po) battery—the largest ever in a flagship Galaxy Note at the time of its release. This was a significant upgrade from the Note 8's 3,300 mAh battery (about 21% larger) and larger than the Galaxy S9+'s 3,500 mAh.
Samsung positioned it for all-day use (talk, text, games, video, etc.), and independent tests generally confirmed strong endurance for a 2018 flagship. GSMArena's endurance rating was 97 hours. Real-world screen-on times typically ranged from roughly 5–8+ hours depending on usage, resolution, and brightness, with many users reporting solid full-day (or better) performance under mixed use.
The battery was one of the standout upgrades of the Note 9, helping deliver reliable all-day performance in a premium productivity-focused phablet. Actual results depend on software version (up to Android 10 / One UI 2.5), usage patterns, screen resolution/brightness, and battery age/condition.
SpecificationDetailsCapacity4,000 mAhTypeLi-Ion / Li-Po, non-removableWired chargingUp to 15 W (Samsung Adaptive Fast Charging / Qualcomm Quick Charge 2.0 / AFC)Wireless chargingYes (Qi / WPC and PMA standards; up to ~15 W fast wireless, market-dependent)Reverse chargingNoCharging time (approx.)~50% in ~30–35 minutes; full charge ~1 hour 40–50 minutes (wired)OtherUSB Type-C; supports standard and fast chargers
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