How Long to Charge a Samsung Galaxy Tab S9 Ultra Battery?
Charging a Samsung Galaxy Tab S9 Ultra Battery from empty to full takes about 351 h 22 min with its standard 45W charger. The battery holds roughly 11200 Wh, and this page estimates the time for every common charger wattage, using the Lithium-ion (Li-ion / Li-Po) chemistry it actually uses.
Charge time calculator for Samsung Galaxy Tab S9 Ultra Battery
Estimated charge time
351 h 22 min
Includes the slower li-ion taper phase above 80%.
Charge time by charger wattage
| Charger | Power | Full charge (0-100%) |
|---|---|---|
| Standard charger | 15W | 1054 h 7 min |
| Fast charger | 45W | 351 h 22 min |
| Ultra-fast charger | 65W | 243 h 15 min |
Battery capacity: 11.2 kWh · Chemistry: li-ion
Modern devices negotiate power with USB-C PD or a proprietary fast-charge protocol, so plugging into a higher-wattage charger is safe: the device itself decides how much power to draw.
This is a large battery: budget several hours, often best left charging overnight or during the day while you're not using it.
With the fastest charger listed here (Ultra-fast charger, 65W) it takes about 243 h 15 min. With the slowest (Standard charger, 15W) it takes about 1054 h 7 min. Samsung's largest tablet features a massive 14.6-inch AMOLED display paired with a high-capacity battery.
Frequently asked questions
- How long does it take to charge a Samsung Galaxy Tab S9 Ultra Battery?
- From 0% to 100% with the standard 45W charger, it takes about 351 h 22 min. Using a faster charger shortens that; using a weaker one extends it, see the table above for exact numbers.
- Can I use a higher-wattage charger to charge it faster?
- Yes, as long as the charger is compatible with the device's connector and voltage. The battery's own charge controller limits how much current it accepts, so a more powerful charger reduces time mainly in the 0-80% range; above 80% lithium-ion packs taper the charge rate for safety regardless of charger wattage.
- Why does charging slow down near the end?
- Lithium-ion batteries charge at full power up to about 80%, then switch to a slower "taper" phase that protects the cells from stress at high voltage. That's why the last 20% often takes nearly as long as the first 80%.
- How is this charge time calculated?
- We divide the energy needed (11200 Wh times the percentage you're charging) by the charger's effective power, which is the charger's wattage times the battery chemistry's real-world charging efficiency (85% for Lithium-ion (Li-ion / Li-Po)). The same formula powers both this page and our API.
ChargeTimeCalculatorestimates are based on typical charger efficiency and battery chemistry, not a live connection to your device. Always follow your manufacturer's charging guidance.