Galaxy S25 Edge battery beats the S25 Ultra’s, but not in the way you think

Samsung has faced a lot of criticism for the Galaxy S25 Edge's battery capacity. People think Samsung cut the corners with the phone's 3,900mAh battery and that it could have fitted a bigger battery inside its ultra-slim phone. However, it appears that the phone's battery actually beats the Galaxy S25 Ultra's battery in an important way.

YouTube channel WekiHome posted a teardown video of the Galaxy S25 Edge, revealing its battery and its energy density. It has an energy density of 758Wh/L, which is better than that of the 727Wh/L density of the Galaxy S25 Ultra's 5,000mAh battery. So, it appears that Samsung made efforts to improve the battery capacity of its ultra-slim phone compared to its regular flagship device.

The OPPO Find N5, which was praised for its big battery (for its size), uses a battery with a Silicon Carbon anode. Its battery density is 810Wh/L, according to tipster Ice Universe. And if Samsung used a similar Silicon Carbon anode battery in the Galaxy S25 Edge, the phone's battery capacity would be just slightly higher at 4,200mAh, and that isn't a major difference.

Since the Galaxy Note 7 battery fire fiasco, Samsung has been extremely cautious with battery and related fire risks. So, it makes sense that it decided to use a conventional Lithium Ion battery in the Galaxy S25 Edge rather than going with Silicon Carbon batteries without full risk assessment of the new battery technology.

Tipster Ice Universe, who is extremely critical of Samsung, said the South Korean firm shouldn't be blamed for the Galaxy S25 Edge's battery. They also said it is people's wishful thinking if they think claim Chinese brands would have been able to fit a similarly thin phone with a 6,000mAh battery. So, it appears that the South Korean firm indeed did well in that regard and could bring higher battery capacity with its future phones.