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Samsung Galaxy S27 Ultra Battery Details Leaked; Could Top iPhone 18 Pro Max's Battery Capacity

Samsung Galaxy S27 Ultra Battery Details Leaked; Could Top iPhone 18 Pro Max's Battery Capacity

Samsung SDI is reportedly evaluating 5,600mAh battery cells.

Written by Sucharita Ganguly, Edited by David Delima | Updated: 3 July 2026 19:31 IST

Samsung Galaxy S27 Ultra Battery Details Leaked; Could Top iPhone 18 Pro Max's Battery Capacity

Every Galaxy S Ultra model from the S20 Ultra to the S26 Ultra has a 5,000mAh battery

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Highlights

Samsung could retain lithium-ion battery technology
5,600mAh and 5,800mAh batteries are reportedly under evaluation
The upgrade could end years of 5,000mAh Ultra batteries

Samsung's Galaxy S27 Ultra could receive its first major battery upgrade in several years, according to a new leak. The handset is said to be under evaluation with a larger battery than previously expected, potentially giving Samsung's next flagship an advantage over the rumoured iPhone 18 Pro Max in terms of battery capacity. The latest leak also suggests the company may continue relying on lithium-ion technology instead of adopting silicon-carbon batteries, despite the shift by various rival smartphone brands.

Samsung Reportedly Testing Bigger Batteries for Galaxy S27 Ultra

According to an X post by a tipster known as Schrödinger (@phonefuturist), Samsung is reportedly evaluating 5,600mAh and 5,800mAh battery cells developed by Samsung SDI for the Galaxy S27 Ultra. The post further suggests Samsung had previously finalised a 5,200mAh lithium-ion battery before reopening evaluation of larger cells. If internal testing proves successful, the smartphone could launch with a battery capacity exceeding 5,500mAh.

Samsung Galaxy S27 Ultra Discussion

Privacy Display on Galaxy S27 Pro

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The report indicates Samsung is continuing with conventional lithium-ion batteries instead of adopting silicon-carbon cells for the upcoming flagship. Several Chinese smartphone makers have already adopted silicon-carbon batteries because they offer higher energy density than conventional lithium-ion cells. Instead of changing battery chemistry, the company is reportedly working on increasing the efficiency of its current lithium-ion design.

Samsung Galaxy S27 Series Leak Hints at These Display, Camera Upgrades

If the rumoured upgrade materialises, it would mark the first increase in battery capacity for Samsung's Ultra series in several years. The Galaxy S20 Ultra, Galaxy S21 Ultra, Galaxy S22 Ultra, Galaxy S23 Ultra, Galaxy S24 Ultra, Galaxy S25 Ultra and the recently launched Galaxy S26 Ultra all feature 5,000mAh batteries. Although each generation has delivered longer endurance through hardware and software refinements, Samsung has continued to list the same 5,000mAh battery capacity.

The latest claim follows recent reports suggesting Apple's iPhone 18 Pro Max could feature a 5,425mAh battery in the eSIM version and a 5,235mAh battery in markets that continue to use a physical Nano-SIM tray. Should both reports prove accurate, Samsung's next Ultra handset would carry the larger battery capacity of the two devices.

Early GSMA Listing Hints at New Samsung Galaxy S27 Pro Model

Even so, battery size by itself is not a reliable measure of real-world battery life. Since Samsung and Apple use different hardware and operating systems, any direct comparison will depend on real-world testing after launch. Until Samsung officially announces the Galaxy S27 Ultra, the leaked battery specifications should be treated as unconfirmed.

Samsung Galaxy S20 Ultra

REVIEW
KEY SPECS
NEWS

Design
Display
Software
Performance
Battery Life
Camera
Value for Money

Good
Top-notch build quality
Gorgeous display
Excellent cameras, zoom capability
Good battery life
Clean UI

Bad
Big and unwieldy
Extremely expensive

Read detailed Samsung Galaxy S20 Ultra review

Display 6.90-inch

Processor Samsung Exynos 990

Front Camera 40-megapixel

Rear Camera 108-megapixel + 48-megapixel + 12-megapixel + Depth

RAM 12GB

Storage 128GB

Battery Capacity 5000mAh

OS Android 10

Resolution 1440x3200 pixels

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Samsung Galaxy S21 Ultra

REVIEW
KEY SPECS
NEWS

Design
Display
Software
Performance
Battery Life
Camera
Value for Money

Good
Excellent telephoto cameras
Superb display
Solid battery life
Very good performance

Bad
Ads in some first-party apps
Expensive
Heats up under stress
Heavy and bulky

Read detailed Samsung Galaxy S21 Ultra review

Display 6.80-inch

Processor Samsung Exynos 2100

Front Camera 40-megapixel

Rear Camera 108-megapixel + 12-megapixel + 10-megapixel + 10-megapixel

RAM 12GB, 16GB

Storage 128GB, 256GB, 512GB

Battery Capacity 5000mAh

OS Android 11

Resolution 1440x3220 pixels

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Samsung Galaxy S22 Ultra

REVIEW
KEY SPECS
NEWS

Design
Display
Software
Performance
Battery Life
Camera
Value for Money

Good
In-built S Pen stylus
Superb display
Impressive performance
Versatile cameras
Good battery life
IP68 rated

Bad
Gets warm easily under load
Big and bulky
No bundled charger
Expensive

Read detailed Samsung Galaxy S22 Ultra review

Display 6.80-inch

Processor Qualcomm Snapdragon 8 Gen 1

Front Camera 40-megapixel

Rear Camera 108-megapixel + 12-megapixel + 10-megapixel

RAM 8GB, 12GB

Storage 128GB, 256GB, 512GB, 1TB

Battery Capacity 5000mAh

OS Android 12

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Samsung Galaxy S23 Ultra

REVIEW
KEY SPECS
NEWS

Design
Display
Software
Performance
Battery Life
Camera
Value for Money

Good
Unique design
Bright and accurate display
Good gaming performance
Excellent cameras, quality video recording
Solid battery life

Bad
Expensive
Still too large for most hands
Loaded with bloatware
Relatively slow charging

Read detailed Samsung Galaxy S23 Ultra review

Display 6.80-inch

Processor Snapdragon 8 Gen 2

Front Camera 12-megapixel

Rear Camera 200-megapixel + 12-megapixel + 10-megapixel

RAM 8GB, 12GB

Storage 256GB, 512GB, 1TB

Battery Capacity 5000mAh

OS Android 13

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Samsung Galaxy S24 Ultra

REVIEW
KEY SPECS
NEWS

Design
Display
Software
Performance
Battery Life
Camera
Value for Money

Good
Bright display with fewer reflections
Great battery life
Useful AI features
Excellent performance
Top-quality cameras
Longer software support

Bad
Expensive
Relatively slower charging speeds

Read detailed Samsung Galaxy S24 Ultra review

Display 6.80-inch

Processor Snapdragon 8 Gen 3

Front Camera 12-megapixel

Rear Camera 200-megapixel + 12-megapixel + 50-megapixel + 10-megapixel

RAM 12GB

Storage 256GB, 512GB, 1TB

Battery Capacity 5000mAh

OS Android 14

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Samsung Galaxy S25 Ultra

REVIEW
KEY SPECS
NEWS

Design
Display
Software
Performance
Battery Life
Camera
Value for Money

Good
New design is for the better
Cameras deliver consistent performance
Good battery life
Excellent performance
Smooth UI

Bad
S-Pen is a downgrade
No Dolby Vision support
Low light camera performance is lacking
Slow charging

Read detailed Samsung Galaxy S25 Ultra review

Display 6.90-inch

Processor Snapdragon 8 Elite

Front Camera 12-megapixel

Rear Camera 200-megapixel + 50-megapixel + 50-megapixel + 10-megapixel

RAM 12GB, 16GB

Storage 256GB, 512GB, 1TB

Battery Capacity 5000mAh

OS Android 15

Resolution 1400x3120 pixels

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Samsung Galaxy S26 Ultra

REVIEW
KEY SPECS
NEWS

Design
Display
Software
Performance
Battery Life
Camera
Value for Money

Good
Lighter IP68 rated design
Privacy Display is handy and practical
One UI gets smarter with better AI integrations
Fast-charging finally
Impressive video recording capability

Bad
3x telephoto camera needs work
Low-light performance could have been better
Selfies don?t show accurate edge-detection
S Pen cannot be used as camera remote

Read detailed Samsung Galaxy S26 Ultra review

Display 6.90-inch

Front Camera 12-megapixel

Rear Camera 200-megapixel + 50-megapixel + 50-megapixel + 10-megapixel

RAM 12GB, 16GB

Storage 256GB, 512GB, 1024GB

Battery Capacity 5000mAh

OS Android 16

Resolution 1,440x3,120 pixels

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Further reading: Samsung Galaxy S27 Ultra, Samsung, Samsung SDI, Samsung Galaxy S27 Ultra Battery, iPhone 18 Pro Max, Apple

Sucharita Ganguly

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Sucharita is a writer with Gadgets 360 and is mostly found playing with her cat in her free time. She has previously worked at breaking news desks across organizations. Powered by coffee, The Beatles, Bowie, and her newfound love for BTS, she aims to work towards contributing to a better media environment for women and queer folk. More