
Breakthrough smartwatch battery technology is believed to debut on Samsung devices as soon as 2026.
The new oxide-based batteries have a density of 200 watt-hours per litre and are much closer to larger lithium-ion batteries, according to the Korea Herald.
The aim will be to replace lithium batteries, as the solid-state oxide batteries are safer, more efficient, and more flexible than existing technology.

Samsung Electro-Mechanics’ CEO Chang Duk-hyun said the company had “conducted extensive internal testing and is in discussions with clients.”
If the new batteries were to make it to production on schedule, the 2026 Samsung Galaxy Watch could see a big leap in battery life.

Last year, as ChannelNews reported here, Japanese electronics parts maker TDK Corporation claimed that it managed to develop a material for solid-state batteries with 100 times higher energy density compared to its conventional solid-state batteries.
A higher energy density means more energy storage within less space inside a device. Theoretically, it could offer significantly longer battery life for the device which it powers.
TDK says that it successfully developed the material for CeraCharge, a next-generation solid-state battery that would reportedly offer an energy density of 1,000 Wh/L.
That success it says was possible due to the use of oxide-based solid electrolyte and lithium alloy anodes.
It noted that the new battery could find a place in various wearable devices such as wireless earphones, hearing aids and even smartwatches, with the goal of replacing existing coin cell batteries.