Best Phone Battery Life in 2025: The Longest Lasting Smartphones

When shopping for a new smartphone, Australians often focus on camera quality, storage capacity, or screen design, but there’s one feature that can make or break your daily experience: battery life. After all, what good is a high-end camera if your phone dies before you can capture the sunset? 

Fortunately, the most advanced phones of 2025 prove that it’s possible to have both cutting-edge features and incredible battery endurance. Thanks to bigger batteries, energy-efficient chipsets, and smarter software optimisation, today’s top handsets last significantly longer than models just a few years ago. If you’re looking for the longest-lasting smartphones available in Australia, this guide breaks down the best performers from our tests and explains what makes them stand out.

Why Battery Life Matters More Than Ever

Australians are using their smartphones for more power-hungry tasks, streaming 4K shows on Disney Plus or Binge, Zoom calls over mobile data, and even dabbling in AI-powered editing apps. With all this added demand, poor battery life can mean carrying around a charger or battery pack constantly.

Modern smartphones fight this battle with:

• Bigger batteries (up to 6,000 mAh in 2025’s flagships).
• Efficient processors like Apple’s A19 Pro and Qualcomm’s Snapdragon 8 Elite.
• Adaptive refresh rate displays to balance smooth visuals with power savings.
• Fast charging technology, with many phones hitting 50–75% in just 30 minutes.

The Longest Lasting Smartphones in 2025

Below is a look at the top performers for battery life, based on average test results for web browsing and everyday use.

Spotlight on Top Performers

Asus Zenfone 12 Ultra (20+ hours)

For gamers and heavy users, nothing beats Asus’ Zenfone line. The Zenfone Phone 12 Ultra boasts the longest battery life of any smartphone right now. With a massive 5,800 mAh battery, adaptive refresh rates, and efficient Snapdragon 8 Elite chipset, it can easily last two full days of use. Plus, 65W charging means less downtime when you finally do plug in.

iPhone 17 Pro Max (17 hours, 54 minutes)

For Apple users, the iPhone 17 Pro Max is the longest-lasting iPhone ever released. Powered by the efficient A19 Pro chipset and optimised by iOS 19, it delivers all-day (and then some) endurance. With 40W fast charging now standard, iPhone users finally get a charging speed upgrade.

Samsung Galaxy S25 Ultra (17 hours, 14 minutes)

The Samsung Galaxy S25 Ultra balances strong battery performance with its high-end photography and display features. With a 5,000 mAh battery and Snapdragon 8 Elite chipset, it offers 17 hours of usage while powering a vivid QHD+ AMOLED display and advanced camera system. Thanks to 45W fast charging, users can quickly top up and stay connected throughout the day.

Motorola Razr Ultra 2025 (15 hours, 42 minutes)

Foldable phones usually lag behind in endurance, but the Razr Ultra 2025 shatters expectations. Its large 4,700 mAh battery combined with smart software tweaks gives users nearly 19 hours of life in efficiency mode, making it a true outlier in the foldable category.

Battery Care Tips for Australians

To keep your phone’s battery running smoothly over years of use, try these best practices:

• Avoid full discharges: Keep your charge between 20%–80% for longer lifespan.
• Use adaptive charging if supported, so your phone slows down charging overnight.
• Stick to official/compatible chargers to avoid damaging your battery.
• Lower screen refresh rates (e.g., 60Hz) when you don’t need smooth motion.

Buy Now: Where to Get the Best Deals in Australia

• iPhone 17 Pro Max: Available from Apple Australia and major telcos (Optus, Telstra, Vodafone) with 12–36 month contract options. Best suited to those needing long endurance with Apple’s app ecosystem.
• Samsung Galaxy S25 Ultra: Sold outright via Samsung AU or JB Hi-Fi, and bundled with plans from all big three telcos. Perfect for photography lovers who also want strong performance.
• Asus ROG Phone 9 Pro: Best option for gamers. Available from selected retailers like JB Hi-Fi and online importers.
• Motorola Razr Ultra 2025: Offered via Optus and Telstra plans — a foldable phone with excellent endurance.
• Budget endurance heroes like the Moto G (2025) and OnePlus 13R can be found through Amazon AU or grey importers.

Choosing a phone in 2025 isn’t just about raw specs, battery life matters more than ever as we use our phones for work, entertainment, and even smart home control. From the unbeatable ROG Phone 9 Pro to the ultra-efficient iPhone 17 Pro Max, there’s now a long-lasting device for every type of Australian user, whether you’re a gamer, power user, foldable fan, or budget-conscious buyer.

Check out our mobile comparator below to get the best data plan for your new phone. 

Price Range

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Cheapest Under $20 Mobile Plans

Rank	Provider	Detail	Price	Link
#1		Optus 7 Day Pre-Paid 3GB data network / enabled Unlimited Domestic Calls eSIM Available	$12.00 Per 7 Day Renewal Pre-paid	See Detail
#2		Vodafone 7 Day Pre-Paid 5GB data network / enabled Unlimited Domestic Calls	$12.00 Per 7 Day Renewal Pre-paid	Go to site
#3		Telstra 7 Day Pre-Paid 3GB data network / enabled Unlimited Domestic Calls eSIM Available	$13.00 Per 7 Day Renewal Pre-paid	See Detail
#4		Boost Mobile 7 Day Pre-Paid 5GB data network / enabled Unlimited Domestic Calls eSIM Available	$13.00 Per 7 Day Renewal Pre-paid	Go to site
#5		tele choice 6 GB Pre-Paid 6GB data network / enabled Unlimited Domestic Calls	$17.00 Per 28 Day Renewal Pre-paid	Go to site
#6		tele choice Basic 8GB data network / enabled Unlimited Domestic Calls	$19.00 Per Month Post-paid	Go to site
#7		Aldi Mobile 10 GB Plan 10GB data network / enabled Unlimited Domestic Calls	$19.00 Per Month Post-paid	See Detail
#8		Yomojo 8 GB Plan 8GB data network / enabled Unlimited Domestic Calls eSIM Available	$19.90 Per Month Post-paid	See Detail
#9		Lebara Mobile 10 GB Pre-Paid 10GB data network / enabled Unlimited Domestic Calls eSIM Available	$19.90 Per 1 Month Renewal Pre-paid	See Detail
#10		Exetel Saver Pre-Paid 7GB data network / enabled Unlimited Domestic Calls eSIM Available	$20.00 Per 1 Month Renewal Pre-paid	Go to site
#11		Catch Connect 15 GB Pre-Paid 15GB data network / enabled Unlimited Domestic Calls	$20.00 Per 28 Day Renewal Pre-paid	Go to site
#12		Kogan Small Pre-Paid 15GB data network / enabled Unlimited Domestic Calls eSIM Available	$20.00 Per 1 Month Renewal Pre-paid	Go to site

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By Savannah Walker

Energy & Telecom SEO Specialist

Savannah Walker is Selectra’s SEO Project Manager and Editor, leading the team that focuses on energy, telecommunications and consumer technology, across news, reviews and how-tos.