Tecno's latest concept, the Spark Slim, is poised to become the world’s thinnest smartphone at just 5.75mm. It boasts a surprisingly powerful 5,200mAh battery, which is larger than the one in the Galaxy S25 Ultra.
The smartphone market is no stranger to innovations aimed at making devices thinner and more powerful. Tecno, a brand known for pushing the boundaries of smartphone technology, has unveiled its latest concept device, the Tecno Spark Slim. With a design that measures just 5.75mm thick, it is aiming to become the world’s thinnest smartphone.
To put this into perspective, the Spark Slim is over 33% thinner than the Samsung Galaxy S25 Ultra and nearly 2mm slimmer than the iPhone 16. While this is an impressive achievement, the Spark Slim's design doesn’t just focus on slimness—it's also packing a powerful 5,200mAh battery. This is 200mAh more than the battery found in the Galaxy S25 Ultra, despite the device being significantly thinner.
This breakthrough in battery technology is likely due to the use of silicone-carbon batteries, a development that has been making its way into smartphones over the past year. Such batteries are helping manufacturers like OnePlus and Oppo deliver larger battery capacities in phones that are still slim and lightweight. In the case of the Spark Slim, this new battery tech allows Tecno to fit a 5,200mAh battery into a device that’s thinner than many of its competitors, including premium models like the iPhone and Samsung Galaxy.
However, there is a catch. The Tecno Spark Slim is not yet available for purchase. While the company is showcasing the device at MWC 2025 in Barcelona, it remains a concept for now. Tecno has yet to confirm when, or if, the Spark Slim will be released to the market. For now, it serves as a glimpse into what the future of ultra-thin smartphones might look like.
Tecno has a history of unveiling concept devices at events like MWC, and many of them have not yet reached consumers. Despite this, the Spark Slim has generated significant interest because of its unique combination of slim design and high battery capacity, something that hasn’t been seen in the smartphone market before.
As we wait for more details about the future of the Spark Slim, one thing is clear: Tecno is determined to lead the charge in the next wave of ultra-thin smartphone design. Whether or not the Spark Slim will become a reality remains to be seen, but its design offers valuable insights into how mobile technology might evolve in the coming years.
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