We’ve all been there. It’s a late train home, and just when you most need your phone to catch up on the news, update your family or simply relieve the boredom, it’s game over for its battery. Whether your current mobile is getting on, or its battery simply doesn’t share your taste for binge watching, we’ll help you find a better match in our best battery life phone guide.
Batteries have come a long way since the early days of mobiles. Up until the mid-1990s, phones suffered with heavy nickel metal hydride (NiMH) cells that took ages to recharge, ran down quickly, and had a comparatively short lifespan. Things got better with the mainstream arrival of lithium ion (Li-ion) cells, which store more energy and wear out more slowly. The technology keeps improving, with today’s phones packing cells that go all day, charge in an hour or two, and last for at least a few years of daily use.
You’ll often see manufacturers talk about the power of a mobile phone battery in milliamp hours (mAh). This simply describes how much energy they can store, with a higher number being better. A small-ish battery might be rated at 3,000mAh, while the biggest are around 5,000mAh or more. Generally, a bigger battery lasts longer, but it depends on other things, like how big the screen is and how efficiently the phone can run.
Realistically, how you use your phone is one of the biggest factors in how much battery life you get. The screen is usually the single biggest drain, so anything that keeps it on will increase your chances of running out of charge. A phone’s chip is power-hungry when it’s working hard, so multimedia, and particularly gaming, will guzzle up the battery. It’s also worth considering data: heavy roaming, Bluetooth or WiFi activity drains the power too.
Perhaps less obviously, the number of apps you install has a bearing on how long a charge lasts. Many apps operate or update in the background, using power, and widgets may run more processes, exaggerating the problem. If you want to get the longest out of each charge, disable widgets, use the phone as little as possible, and keep the screen off as much as you can. On some phones, switching 5G off can help too.
And if you feel like your battery used to last longer, you might be right. Today’s phone batteries have a long life, but they do lose capacity over time. Both iOS and Android now include smart charging features to minimise battery ageing, and we’ve tested three-year-old phones that still have more than 90% of their original capacity.
If it’s time for a new phone, the good news is that it’s hard to find a modern phone with a bad battery. Some are much better than others, though, and the phones below are the longest-lasting you’ll find on Mozillion right now.
Why buy? The longest-lasting iPhone ever.
If you want an iPhone that simply refuses to die, this is it. Apple rates the 18 Pro Max for up to 45 hours of video playback, the longest of any iPhone to date, so a heavy day of gaming, streaming and photos still won’t have you hunting for a charger before bed.
The efficient 2nm A20 Pro chip is the secret: it sips power when you’re not pushing it, and the big body leaves plenty of room for a large cell. Fast wired and MagSafe charging get you back up quickly when you do run low.
It is big and pricey, but for outright iPhone endurance, nothing else comes close.
Why buy? The longest-lasting big Android flagship.
Among Android flagships, the Galaxy S26 Ultra is the one to beat for stamina. Its 5,000mAh battery is paired with Samsung’s efficient latest Snapdragon 8 Elite for Galaxy, and in independent testing it is among the longest-lasting phones you can buy, comfortably clearing a full day with charge to spare and around 20 hours of looping video.
The big, bright 6.9-inch LTPO AMOLED can drop to very low refresh rates to save power, and fast charging means a short top-up goes a long way. Seven years of updates keep it going for years.
If you want the best Android phone and the longest battery to match, start here.
Why buy? Nearly the same stamina, for less.
Last year’s big Pro is still one of the longest-lasting phones around, and now it costs less than the 18 Pro Max. With a roughly 5,000mAh battery and the efficient A19 Pro chip, independent tests put it right at the top for endurance, with more than 20 hours of browsing on a charge.
You get the same enormous 6.9-inch ProMotion screen that can wind its refresh rate down to save power, plus fast wired and MagSafe charging.
If you want flagship battery life but would rather not pay the very newest price, the 17 Pro Max is the smart buy.
Why buy? The biggest-battery Pixel, and the fastest-charging.
If you like Google’s phones but have been let down by Pixel battery life before, the 11 Pro XL fixes it. It carries the largest cell in the range at 5,115mAh, and it is the only Pixel with 45W fast charging, good for around 75% in half an hour.
The Tensor G6 chip is tuned for efficiency as much as speed, so that big battery turns into genuine all-day endurance, and the 6.8-inch LTPO screen drops its refresh rate when nothing is moving.
For Pixel fans who want the longest-lasting option, this is the one.
Why buy? Flagship endurance, lighter and cheaper than the Ultra.
Not everyone wants a giant phone, and the Galaxy S26+ is the sweet spot for battery in Samsung’s range. Its 4,900mAh battery is far bigger than the standard S26’s, and the efficient chip and sharp 120Hz AMOLED make it a reliable all-day-plus performer.
It is lighter and cheaper than the Ultra while still delivering the stamina most people want, and it gets the same seven years of updates.
If the Ultra is more phone than you need but battery still matters, the S26+ is the one to get.
Why buy? The best battery for the money.
Great battery life isn’t just for flagships. The Galaxy A57 5G packs a 5,000mAh battery with 45W charging, and because its mid-range chip and screen don’t draw much power, Samsung’s A-series phones are perennial endurance champions, regularly outlasting pricier flagships.
You also get a bright 6.7-inch 120Hz AMOLED, 5G and IP68 water resistance, plus Samsung’s long update support. Performance is modest, but for hours per pound it is hard to beat.
If you want a phone that lasts without spending big, this is the one. And the cheaper Galaxy A37 5G has the same 5,000mAh battery if your budget is tighter still.
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