Samsung Tests 20,000mAh Smartphone Battery in Potential Breakthrough for Battery Life

Written by Nour Abdelkader

Samsung is preparing for a possible leap forward in smartphone battery technology, after a recent report revealed that the company is testing an experimental battery with a massive 20,000mAh capacity — far beyond anything currently available in smartphones.

According to leaks, Samsung SDI, the company’s battery manufacturing arm, is developing a dual-cell silicon-carbon battery. If successful, this technology could pave the way for smartphones that last several days on a single charge, instead of the typical one to two days.

Samsung’s Cautious Strategy May Shift

While several Android manufacturers have already adopted silicon-carbon battery technology, Samsung has taken a more conservative approach. The company continues to rely on traditional lithium-ion batteries, even in its latest devices such as the ultra-thin Galaxy S25 Edge.

However, current indicators suggest this strategy may change in the coming years, according to a report by Android Headlines reviewed by Al Arabiya Business.

An Unprecedented Battery Capacity

Reports indicate that the new battery uses a dual-cell design, with a primary cell rated at 12,000mAh and a secondary cell at 8,000mAh, bringing the total capacity to an unprecedented 20,000mAh — a dramatic jump in the smartphone market.

While silicon-carbon batteries are not entirely new — Honor recently launched a device with a 10,000mAh battery — Samsung appears to be aiming to nearly double that figure.

What Makes Silicon-Carbon Batteries Different?

Unlike conventional lithium-ion batteries that use graphite for the anode, silicon-carbon batteries replace it with a silicon-carbon compound. This allows the battery to store significantly more lithium ions.

Estimates suggest this technology could theoretically increase battery capacity by up to ten times without a major increase in physical size, potentially bringing back multi-day battery life reminiscent of older feature phones.

Safety Challenges Remain

Despite the excitement, reports urge caution. The battery is still in the testing phase and has reportedly faced safety issues, including swelling of the secondary cell by as much as 80% during trials.

Given Samsung’s past sensitivity around battery safety incidents, the company is expected to proceed very carefully before considering any commercial release.

Part of a Longer-Term Strategy

This is not Samsung’s first exploration of silicon-carbon batteries. The company recently announced a partnership with KGM to develop this technology for electric vehicles rather than smartphones.

Although there is no confirmed timeline for launching a phone with a 20,000mAh battery, these leaks reinforce expectations that Samsung could fundamentally reshape smartphone battery life by the end of the decade — provided safety challenges are successfully resolved.