If you’re eyeing the Galaxy S25 Ultra as your next big upgrade, you need to hear this before you start saving.
Samsung’s 2025 flagship might still be stuck with a 5,000mAh battery and 45W wired charging – the same basic setup we’ve seen since the Galaxy S20 Ultra in 2020. In a world where 120W and 150W charging is normal on Android flagships, that’s not just boring, it’s borderline anti-consumer for a phone that will likely start around $1,299.
Five years, same 5,000mAh: what are we doing here?
Let’s be clear: 5,000mAh is not bad. On the right hardware, with smart software optimization, it can deliver genuinely strong endurance. The Galaxy S24 Ultra with its Snapdragon 8 Gen 3 for Galaxy, LTPO 120Hz AMOLED panel, and 4nm process already proves Samsung can squeeze good battery life from that capacity.
But here’s the problem: the rumor is that the Galaxy S25 Ultra sticks to exactly that 5,000mAh pack – effectively the same capacity Samsung shipped on the Galaxy S20 Ultra five years earlier. Meanwhile, rivals aren’t standing still.
You’ve got Xiaomi 14 Ultra-class devices with 5,300mAh batteries and 90W–120W charging, OnePlus 12 with a 5,400mAh cell and 80W/100W SuperVOOC, and even midrange phones pushing 5,500mAh or more. On paper, Samsung looks like it hit pause while everyone else hit fast-forward.
Yes, efficiency matters more than raw mAh, but capacity still sets the ceiling. If you’re cranking a 1440p 120Hz display, pushing Ray Tracing in games on a custom Snapdragon 8 Gen 4 for Galaxy (very likely), and running heavier AI features on-device, you want headroom – not a battery spec frozen in 2020.
45W in 2025: flagship or midrange cosplay?
The more annoying part isn’t even the capacity – it’s the charging speed.
Rumors from Korean supply chain chatter suggest Samsung will keep 45W wired charging on the Galaxy S25 Ultra. That’s the same rating we saw on the Galaxy S22 Ultra, S23 Ultra, and S24 Ultra. On paper, you’re looking at roughly 0–65% in around 30 minutes, and a full charge closer to an hour.
Compare that to:
- OnePlus 12 – 80W (US) / 100W (global), roughly 0–100% in ~30 minutes
- Xiaomi 14 Ultra – 90W wired, often 0–100% in under 40 minutes
- iQOO 12 – 120W, full charges in around 25 minutes
- Even some budget and midrange phones from Chinese brands – 67W as standard
In that context, 45W in 2025 on a $1,200+ phone looks weak. Samsung will justify it with battery health claims, and they won’t be totally wrong: slower charging can mean less heat and better lifespan. But consumers deserve options – like a 65–80W mode for people who prioritize speed and understand the trade-offs.
Right now, Samsung is effectively saying: pay premium prices, get conservative charging because we decided you don’t need more.
Samsung is betting on efficiency and AI – and hoping you don’t mind
To be fair, there are reasons Samsung might be comfortable staying at 5,000mAh / 45W.
First, the rumored Snapdragon 8 Gen 4 for Galaxy (or an Exynos 2500 in some markets) should bring better efficiency, especially on 3nm nodes. Couple that with Samsung’s LTPO 120Hz AMOLED panels that can drop as low as 1Hz for static content, and you can absolutely get all-day battery without brute-forcing capacity.
Second, Samsung is visibly shifting its marketing focus to Galaxy AI and long-term support. If the Galaxy S25 Ultra launches with 7 years of OS and security updates, packs a brighter QHD+ AMOLED, and offers improved camera sensors and image processing, a lot of buyers will overlook slow charging.
And in daily use, many people just top up casually on a 15W wireless charger at their desk or use the phone plugged in while working. For them, the difference between 45W and 100W is mostly a spec sheet issue.
But that doesn’t excuse Samsung from phoning it in on a category where Android competitors are absolutely flexing. You can chase AI buzzwords and still respect enthusiasts who actually care how their phone behaves at 5% battery when they’re about to leave the house.
Real-world impact: why 45W still matters to you
Here’s where this hits real users.
Emergency top-ups: With 100W-class phones, you can plug in for 10 minutes and walk away with hours of use. On 45W, that same 10-minute window gives you noticeably less. When you’re traveling, stuck at an outlet, or about to get on a flight, those minutes count.
Weekend trips and heavy use: Pushing 4K60 video, mobile hotspot, GPS navigation, and gaming on a 120Hz panel will destroy any battery. The ability to juice back up fast is part of battery life, not separate from it. Endurance + refill speed is the real metric, and Samsung is only working hard on the first half.
Future-proofing: If you’re buying a Galaxy S25 Ultra and keeping it 4–5 years – which Samsung’s update policy encourages – battery degradation is inevitable. A 5,000mAh cell that’s aged to the effective equivalent of 4,000–4,200mAh in year four hurts less when you can blast it from 10% to 80% in 15–20 minutes. On 45W, you’re just waiting longer for an already tired battery.
So yes, efficiency is great. But if you’re paying flagship money, you’re entitled to both strong endurance and fast charging, not a compromise dressed up as a health feature.
Should you still care about the Galaxy S25 Ultra?
Here’s the nuance: the Galaxy S25 Ultra can still be one of the best all-round Android phones even with 5,000mAh / 45W.
If Samsung upgrades the camera stack – maybe a larger 200MP main sensor, better 3x and 5x telephoto with improved low light, and cleaner processing – plus a brighter QHD+ 120Hz AMOLED around 2,600–3,000 nits, it will still stay in the conversation. Pair that with a powerful Snapdragon 8 Gen 4 for Galaxy, solid stereo speakers, UWB, Wi-Fi 7, and long support, and you’re getting a very complete flagship package.
But battery and charging are one of the few areas where you feel the difference every single day. This isn’t a fringe feature like satellite messaging or niche camera modes. It’s the core experience – how long your phone stays alive, and how quickly you can rescue it.
So if these rumors hold and you see 5,000mAh and 45W on the spec sheet again, go in with your eyes open:
- Pros: Likely strong efficiency, all-day battery for moderate users, potentially better longevity thanks to gentler charging, and a very complete overall spec sheet.
- Cons: Slow charging vs rivals, limited emergency top-up speed, no real progress versus 2020-era Samsung flagships, and a growing gap between premium price and power-user features.
Samsung can absolutely do better here. You don’t have to boycott the Galaxy S25 Ultra, but you also don’t have to clap for incremental battery specs on a phone that will cost more than a decent laptop.
If you care about battery life and charging speed, start voting with your wallet – or at least be loud enough that Samsung hears you when you say: 5,000mAh and 45W in 2025 is not good enough for a top-tier flagship.