Battery life has become one of the biggest battlegrounds for smartphones. For years, Samsung has been fairly conservative with the battery in its Galaxy S Ultra models, and many fans have been hoping for a bigger jump. It looks like that change might finally be coming with the Galaxy S27 series.
Since the S20 Ultra, Samsung has stuck with a 5,000mAh battery in the Ultra lineup. Safety and keeping the phone relatively slim were big priorities after the Note 7 days. But competitors have been pushing harder: Apple’s iPhone 17 Pro Max already beats it, and certification confirms the iPhone 18 Pro Max will go higher.
According to leaker phonefuturist, Samsung is testing larger battery options from Samsung SDI for the S27 Ultra, including 5,600mAh and 5,800mAh cells. There was also talk of a more modest 5,200mAh version. These tested batteries are using standard lithium-ion chemistry rather than newer silicon-carbon tech. This suggests Samsung is playing it safe by sticking with proven, reliable technology instead of taking bigger risks with newer materials, which could also help control costs and limit any potential price increase.
If things go well, the S27 Ultra could finally ship with well over 5,500mAh, a meaningful upgrade that power users have been waiting for.
Of course, this is all still in the rumor stage: the S27 is months away, and specs can change. But if it happens, a larger battery would pair nicely with other expected improvements like wider Privacy Display and refreshed camera island design.
For longtime Galaxy fans who’ve felt the Ultra’s battery capacity has been stuck for too long, this could be a welcome change. We’ll have to wait for more concrete details closer to launch, but this battery story is definitely one to keep an eye on.
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