While other Android phone makers have embraced silicon-carbon batteries with open arms, Samsung has remained cautious. Even its ultra-thin Galaxy S25 Edge uses conventional lithium-ion batteries. However, that could change in the future. According to the latest rumors , Samsung SDI is apparently testing a dual-cell 20,000mAh silicon-carbon battery.
Samsung SDI testing 20,000mAh silicon-carbon battery
High-capacity silicon-carbon batteries aren’t new. In fact, the recently-launched HONOR Win packs a massive 10,000mAh battery, the largest of its kind. However, Samsung could be looking to push the envelope. The rumors are claiming that the Samsung SDI division is reportedly testing out a dual-stacked silicon-carbon battery with a 20,000mAh capacity . That’s honestly kind of wild.
The first and primary cell is said to pack 12,000mAh capacity, while the secondary cell has an 8,000mAh capacity.
But what are silicon-carbon batteries? For those unfamiliar with the tech, these batteries differ from traditional lithium-ion batteries due to the anode. Instead of graphite, it uses a silicon-carbon composite material that is more fracture-resistant. This allows the battery to hold up to 10x more lithium ions, allowing it to hold a larger capacity without necessarily increasing its size.
This means if Samsung is successful, we could eventually see smartphones packing 20,000mAh batteries. It also means that one day, we could get smartphones that last days on end, like the good old feature phone days.
Don’t hold your breath
That being said, don’t get too excited just yet. The battery is apparently still in its experimental stage. During testing, the secondary 8,000mAh battery swelled by 80%. Given Samsung’s history with exploding batteries, we’re sure the company will want to play it safe. However, it’s good to see Samsung looking to adopt new battery technologies.
To be fair, this isn’t Samsung’s first foray into silicon-carbon batteries. Just last week, Samsung SDI announced a partnership with KGM . This partnership would see the company develop silicon-carbon batteries, albeit for use in electric vehicles . Initially, we were disappointed that Samsung’s attempt at these batteries wasn’t for our phones, but the latest rumor gives us some hope.
We’re not sure when Samsung will eventually launch a 20,000mAh phone. This will depend on how well its testing goes, but fingers-crossed that it will happen by the end of the decade.
