Samsung Galaxy S25 Ultra Battery Life & Charging: What You Need to Know

If low battery warnings are constantly interrupting your flow, you’re not alone. From Gen Z’s always-on digital lifestyle to older users relying on their phones for everything from entertainment to staying connected, everyone needs a reliable, long-lasting battery. 

When it comes to long-lasting battery phones, one name that instantly comes to mind is Samsung’s new powerhouse: the Samsung Galaxy S25 Ultra. 

Samsung’s latest flagship, the Galaxy S25 Ultra, is packed with cutting-edge features and has once again raised the bar for smartphone expectations. However, one question that everyone seems to be asking is: how does the Samsung Galaxy S25 Ultra battery life really hold up in everyday use and how fast can it recharge when you’re running low? 

Among power users, the S25 Ultra’s battery setup has already become one of the most talked-about features. People want to know: Is the S25 Ultra’s battery good? Does the S25 Ultra support wireless charging? And just how long does it take to get back to 100%? 

In fact, early adopters have been closely monitoring the Samsung Galaxy S25 Ultra battery test results to see how it compares to previous generations and rival smartphones. After all, nobody wants to be caught off guard by any unexpected Samsung Galaxy S25 Ultra battery issues, specifically when they rely so heavily on their phone for work, play, and everything in between. 

While we’ve covered the full Samsung S25 Series in our detailed S25 Buying Guide, including comparisons across models, this blog is all about taking a closer look at the Galaxy S25 Ultra itself, particularly its battery performance and charging speed. 

So, how does the S25 Ultra battery stack up? Let’s find out. 

Samsung Galaxy S25 Ultra: Full Specs Rundown 

 Before questioning “Is the Samsung S25 Ultra battery good?”, “How long does the Ultra battery last?”, and “What is the battery capacity of the S25 Ultra?”, it’s important to first understand the phone’s specifications because the technology behind the battery plays a huge role in real-world performance, charging speed, and overall reliability. 

Samsung Galaxy S25 Ultra Complete Specs 

Processor	Qualcomm Snapdragon Octa-Core (4.47 GHz)
Display	6.9” Dynamic AMOLED 2X Display (3120 x 1440)
RAM	12GB
Storage	256GB/512GB/1TB
Camera	12MP Front, Rear Cameras: 200MP Wide-Angle, 50MP Ultra Wide, 50MP/10MP Telephone Camera
Operating System (OS)	Android 15
Weight	218g
Connectivity	Wi-Fi 7, 5G
SIM Card Slot	Dual SIM
Colours	Titanium WhiteSilver, Titanium Black, Titatnium SilverBlue, Titanium Grey

Check out all the Samsung Galaxy S25 Ultra colours and choose your favourite at Box.co.uk! 

S25 Ultra Battery Life: Built for the Long Haul 

Samsung has kept the Samsung Galaxy S25 Ultra powerful across the board, and its battery performance is no exception. Equipped with a 5,000mAh typical capacity (non-removable), this device is built to support heavy daily use seamlessly. From morning meetings in London’s coworking hubs to TikTok scrolling on the Tube and streaming content during city commutes, the S25 Ultra battery life delivers the staying power professionals, Gen Z, and other modern users demand. 

Backed by Samsung’s custom-made AP and mDNIe technology, along with intelligent software optimisation, the Samsung Galaxy S25 Ultra goes beyond just raw battery numbers. It’s one of the standouts S25 Ultra features designed to enhance your real-world experience. 

According to the official Samsung Galaxy S25 Ultra battery test, this new powerhouse offers up to 31 hours of continuous video playback under controlled conditions. We’ve tested the phone ourselves, and it’s safe to say it's the best S25 Ultra battery life we’ve seen on any smartphone to date, especially within the bustling environment of London’s fast-paced lifestyle. 

However, what truly sets the S25 Ultra apart isn’t just the massive battery capacity; it's the intelligence behind it. Samsung’s AI-driven battery management system learns your habits, limits unnecessary background activity, and optimises power usage during heavy tasks like mobile gaming and multitasking across apps. That means no sudden battery drops, no overheating, and no mid-commute panic, just smooth, reliable performance throughout the day. 

In typical real-world use, students and casual users can often extend a single charge to a day and a half, while most busy professionals will comfortably navigate a full day of meetings, commuting, and social media. Gamers and content creators will also appreciate the dependable battery endurance for extended sessions, complemented by the bonus of ultra-fast top-ups via enhanced S25 charging technology. 

Among the entire Samsung Galaxy S25 lineup, the Ultra model literally leads the charge with the largest battery and longest playback time. It's yet another reason why when exploring the best Samsung Galaxy phones, the S25 Ultra stands out as a top choice. 

If you’re shopping around, keep an eye out for deals on Samsung mobile phones for sale on Box.co.uk to score a brilliant bargain on your next upgrade. 

How Long Does It Take to Charge an S25 Ultra? 

The Samsung Galaxy S25 Ultra charging setup is built for speed and convenience. If you’re wondering how long it takes to charge an S25 Ultra, the answer is reassuring: around an hour for a full charge. 

While it may not be industry-leading on paper, the charging performance remains consistent, safe, and reliable — exactly what most users need. Samsung has equipped the Galaxy S25 Ultra with 45W wired fast charging, which powers the battery from 0% to 50% in just under 25 minutes and reaches 100% in about an hour. 

That’s an impressive feat, especially considering the phone’s large 5,000mAh battery — delivering both stamina and swift recharging without compromise. 

For those who prefer a cable-free setup, the Samsung Galaxy S25 Ultra also supports 15W wireless charging, along with Wireless PowerShare—Samsung’s handy reverse wireless charging feature that lets you top up your Galaxy Buds or smartwatch on the go. This kind of convenience has become a staple in Samsung Galaxy phones, and it's specifically useful when travelling or out for the day without a charger. 

Overall, the combination of solid wired charging speeds, dependable wireless charging, and battery-conscious design makes the Samsung Galaxy S25 Ultra a very strong performer. If you're upgrading from an older model or even from last year's Ultra, you'll notice faster top-ups and better power handling straight away. Not sure about making the switch? We’ll show you why upgrading from the S24 Ultra to the S25 Ultra is worth it. 

Battery Saving Modes and Software Optimisations 

Raw capacity is only part of the story. What makes the S25 Ultra battery life stand out even more is how intelligently it’s managed behind the scenes. 

Samsung’s One UI continues to lead when it comes to customisation and optimisation. The Adaptive Battery feature monitors your habits and limits power to apps you rarely use, while AI-based app control learns your daily routine to minimise background drain. It’s these kinds of subtle, smart tweaks that deliver meaningful gains across the day, particularly for users juggling dozens of apps. 

There are also two levels of power saving modes built into the phone. You can reduce screen brightness, limit CPU usage, and even pause background network connections. For extreme situations, there's Maximum Power Saving mode — perfect for long-haul travel, festivals, or emergency scenarios when you absolutely need your phone to last. 

If you want to stretch your Samsung Galaxy S25 Ultra battery life even further, switching to Dark Mode is a smart move. Not only is it easier on the eyes during late-night scrolling, but it also helps conserve power on the AMOLED display, which the Samsung Galaxy S25 of course uses. You’ll get better battery life by sticking with the lower resolution setting. Again, you can save a bit more battery by switching to 60Hz, but the butter-smooth motion at higher refresh rates is, in our opinion, well worth the trade-off for that ultra-premium feel. 

Combine these intelligent features with Samsung’s adaptive refresh rate controls, and the result is a device that delivers serious efficiency without compromising the flagship-level experience. 

Simply put, the S25 Ultra doesn’t just keep up with your lifestyle — it actively powers it. 

How to Check Samsung S25 Ultra Battery Health? 

The S25 Ultra comes with a handy new feature that lets you see exactly how your battery is doing—no need for a third-party app or technician. This update is exclusive to the Samsung Galaxy S25 Series and makes it easier than ever to keep tabs on your S25 Ultra battery life. 

Why Check Battery Health? 

Like all Samsung Galaxy phones, the battery in your S25 Ultra slowly wears down over time. Knowing how healthy it is can help you: 

• Spot early signs of battery problems 
• Decide if it's time for a replacement 
• Avoid unnecessary costs and save money (a win for money saving expert phone deals fans!) 

How to Check Samsung S25 Ultra Battery Health? 

How to check Samsung S25 Ultra battery health? It’s now built right into your phone’s settings. With this smart addition to the S25 Ultra features, Samsung makes it easy to stay in control of your phone’s performance, save money, and extend your device’s life.  
To put it short, you don’t need any tools or apps. Just follow these simple steps: 

• Open Settings on your phone 
• Tap on Battery 
• Select Battery Information 

Here you’ll see: 

• Battery Health % – how much life your battery has left 
• Charge Cycle Count – how many times the battery has gone from 0% to 100% 
• Manufacture Date – when the battery was made 
• First Used Date – when it started running in your phone 

This is a brilliant addition to the S25 features list—practical, transparent, and a real money saver. 

What It All Means 

• Higher cycle counts = more wear and tear 
• Lower health % = shorter battery life 
• A worn battery might be the cause of slow charging or poor S25 Ultra battery life 

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How the Samsung Galaxy S25 Ultra Compares to Other Flagships 

The Samsung Galaxy S25 Ultra holds its own among today’s top flagship smartphones, delivering powerful performance, a stellar display, and a feature-rich camera system. While some rivals may edge it out in specific areas, like faster charging or AI integration, the S25 Ultra offers a well-balanced package with consistent software support and ecosystem benefits. Its 45W wired charging, 200MP camera, and long-lasting S25 Ultra battery life make it a strong contender. Compared to other Samsung Galaxy phones and premium devices from Apple, Google, and OnePlus, it remains a dependable all-rounder. Ultimately, the best choice comes down to personal priorities like photography, gaming, or productivity. 

Top Tips to Maximise Your S25 Ultra Battery Life 

To make your battery last longer and reduce the need to recharge frequently, follow these practical tips. Each action below can help improve the Samsung Galaxy S25 Ultra battery life without affecting everyday use too much. 

Use Power Saving Features 

• Switch on power saving mode to cut down background processes and conserve energy, so your phone lasts longer when you need it most. 
• Enable ultra battery saver mode to turn off most features when battery life is low, extending your phone's uptime dramatically. 

Adjust Display Settings 

• Lower the screen brightness or enable adaptive brightness to reduce power usage from the display. 
• Switch to dark mode, which can help save battery on the AMOLED screen by reducing pixel activation. 
• Reduce the refresh rate to 60Hz in settings if you're not watching videos or gaming to cut down energy use. 
• Lower the screen resolution from Quad HD+ to FHD+ to reduce power draw without a noticeable drop in screen quality. 

Manage Apps and Background Activity 

• Close unused apps so they stop using battery in the background. 
• Uninstall apps that you don’t need to free up system resources and save battery. 
• Disable background app refresh for apps that don't need real-time updates to reduce constant background power use. 
• Remove widgets that frequently update, as they often consume power by pulling data in the background. 

Disable Unused Features 

• Turn off GPS when not in use to prevent battery drain from constant location tracking. 
• Switch off vibrate mode if not necessary, as vibrations use more power than ringtones. 
• Disable the Always On Display feature if you’re not using it often to reduce screen-on time. 
• Turn off Bluetooth, mobile data, or Wi-Fi when they’re not in use to avoid extra power consumption. 

Review and Maintain Battery Use 

• Check battery usage in the phone's settings to spot any apps or features using more power than expected. 
• Contact app developers if a particular app is using too much battery or causing performance issues. 

Additional Battery-Saving Habits 

• Restart or switch off your phone during long periods of inactivity to reduce unnecessary background activity. 
• Allow the S25 Ultra a few days to learn your usage patterns; over time, it will adjust settings to improve battery efficiency. 
• Use a power bank when travelling or on busy days to stay powered up without relying on wall sockets. 

Samsung Galaxy S25 Ultra Battery Life: Pros and Cons 

Pros	Cons
Exceptional battery life for all-day use	Full battery potential requires optimisation
Fast and reliable charging performance	Charging speed is solid but not the fastest available
Wireless and reverse charging convenience	Large size and weight
Intelligent battery management
Easy battery health monitoring

 

Should I Buy the Samsung Galaxy S25 Ultra? 

If you live life on 1%, constantly switching between work calls, editing videos, gaming, and navigating your day, then yes, the S25 Ultra is absolutely built for you. The S25 Ultra battery life doesn’t just keep up; it outlasts expectations in real-world conditions. You should buy this phone if you are one of these users: 

Gen Z Creators & Always-On Socialisers 

From capturing matchday selfies to editing TikToks, the S25 Ultra’s sharp camera, smooth performance, and long-lasting battery help you stay connected, creative, and ahead of the trends. Want to see how the camera really performs? Check out our full Samsung Galaxy S25 Ultra camera review. 

Young Professionals on the Move 

Whether you're jumping between video calls and apps or catching up on Black Mirror after hours, the S25 Ultra keeps up with your day thanks to fast charging and dependable battery life. 

Multitasking Go-Getters in Their Prime 

Stream the F1 from your sofa, manage your inbox from a cafe, and help the kids with homework, all on one charge. The S25 Ultra is built to handle family life, career hustle, and entertainment without breaking a sweat. 

Steady Achievers Who Rely on Stability 

Be it navigating the West End with Google Maps or switching between WhatsApp and BBC iPlayer, the S25 Ultra offers a clear screen, smooth experience, and battery life that just works. 

Confident Tech-Savvy Women 

Shoot crisp outfit-of-the-day snaps, manage your business on Instagram, and relax with your favourite podcast—the S25 Ultra delivers performance, style, and freedom with no charger anxiety, now supercharged with Galaxy AI to boost your creativity, productivity, and everyday smarts. Want to see what it can really do? Discover all the AI features of Samsung galaxy S25 Ultra. 

Sports Fanatics & Fitness Streamers 

Stream Premier League highlights or track live cricket scores without a hitch — the S25 Ultra keeps everything running seamlessly. 

Savvy Value Seekers 

If you’re the kind of person who reads reviews before you buy, checks for money saving expert phone deals, and wants a phone that lasts, this one’s for you. Get top-end features, durability, and peace of mind. 

Entertainment Lovers & Mobile Gamers 

Lose yourself in Stranger Things or dominate in Call of Duty: Mobile — all with ultra-smooth motion and breathtaking visuals. With its powerhouse battery and dazzling display, the S25 Ultra turns every stream, swipe, and game into an unforgettable experience. 

Smart & Stylish Seniors (55 and Up) 

Whether you’re sharing holiday photos, reading the news over morning coffee, or video calling with the grandkids, the S25 Ultra offers simple navigation, a bright display, and battery power that easily gets you through the day. 

Order the New Samsung Galaxy S25 Ultra at Box.co.uk 

Looking for your next phone? Get the Samsung Galaxy S25 Ultra now at Box.co.uk! 

If you're in the UK and want the best deal on the Samsung Galaxy S25 Ultra, shop now at Box.co.uk. We offer a wide selection of Galaxy S25 Ultra models, including multiple variants and colours, as well as other popular options from the Samsung Galaxy S25 and Samsung Galaxy S25+ lineup.

Samsung Galaxy S25 Ultra Models Available at Box.co.uk 

Samsung Galaxy S25 Ultra 12GB/256GB 

• Samsung Galaxy S25 Ultra 12GB/256GB Titanium Grey
• Samsung Galaxy S25 Ultra 12GB/256GB Titanium Black  
• Samsung Galaxy S25 Ultra 12GB/256GB Titanium Silverblue  
• Samsung Galaxy S25 Ultra 12GB/256GB Titanium Whitesilver  

Samsung Galaxy S25 Ultra 12GB/512GB 

• Samsung Galaxy S25 Ultra 12GB/512GB Titanium Black
• Samsung Galaxy S25 Ultra 12GB/512GB Titanium Silverblue  
• Samsung Galaxy S25 Ultra 12GB/512GB Titanium Grey  
• Coming Soon: Samsung Galaxy S25 Ultra 12GB/512GB Titanium WhiteSilver 

All Samsung Galaxy S25 Ultra models at Box.co.uk come with a warranty for added peace of mind. Plus, you’ll benefit from expert customer support, fast and reliable delivery, and free UK shipping on qualifying orders. Can’t pay in full? Choose PayPal Pay in 3 to spread the cost of your purchase over three interest-free instalments. And don’t forget to explore our Samsung phone deals to save big on your next upgrade! 

Conclusion 

The Samsung Galaxy S25 Ultra emerges as a formidable contender in the realm of smartphone battery life and charging capabilities. For users across diverse lifestyles, from the digitally native Gen Z to professionals and beyond, the need for dependable power is paramount. The S25 Ultra addresses this with its robust 5,000mAh battery, intelligently managed by Samsung’s software optimisations to ensure it keeps pace with demanding daily routines. Real-world testing confirms its impressive endurance, comfortably lasting a full day and often extending into the next, making low battery warnings a less frequent concern. 

Furthermore, the S25 charging technology offers a blend of speed and convenience. The 45W wired fast charging efficiently replenishes the battery, reaching a full charge in approximately an hour. The inclusion of 15W wireless charging and Wireless PowerShare adds another layer of flexibility for users. Beyond raw power, the S25 Ultra introduces a user-friendly battery health monitoring feature, empowering individuals to understand and manage their device's longevity. While not leading in every single specification compared to its rivals, the Samsung Galaxy S25 Ultra strikes a compelling balance of exceptional battery life, reliable charging, and intelligent power management, solidifying its position as a top-tier choice for those who prioritise lasting power in their mobile experience. 

Android and Samsung loyal? Looking for Samsung mobile phones for sale? Score the Samsung S25 Ultra in your perfect colour, complete with warranty, at the best price from Box.co.uk. Unlock incredible savings with our Samsung phone deals and upgrade your mobile experience today. Happy shopping!