TECNO, a well-known name in the budget smartphone market, is set to showcase the TECNO Spark Slim at MWC 2025. This innovative device is being promoted as the world’s “slimmest phone with a 5,200mAh-plus battery,” measuring just 5.75mm thick. This impressive thickness positions it alongside the rumored Galaxy S25 Edge, while offering a significantly larger battery capacity.
The TECNO Spark Slim boasts a stunning 6.78-inch 3D Curved AMOLED display, a dual rear camera setup featuring 50MP + 50MP sensors, and supports 45W fast charging. In an age where “thin is in,” this smartphone is a noteworthy contender, especially as major players like Samsung and Apple are also focusing on creating slimmer devices. The Galaxy S25 Edge is confirmed, and Apple is rumored to be launching the iPhone 17 “Air”, all emphasizing the trend towards thinner smartphones.
While the TECNO Spark Slim may not be the absolute thinnest phone ever produced—there have been sub-5mm options from OPPO and vivo in the past—its distinction lies in its considerable battery capacity. TECNO’s marketing specifically highlights the slimness in relation to the battery size, which is a significant factor in the smartphone landscape today.
The engineering behind a phone measuring only 5.75mm thick with a robust 5,200mAh battery is truly remarkable, particularly when compared to the Galaxy S25 Edge, which is rumored to have a smaller 4,000mAh battery. Recent advancements in smartphone battery technology, particularly the shift towards silicon-carbon battery technology, have allowed manufacturers to create batteries that offer greater energy density while maintaining a slim profile. Although TECNO has not confirmed if the Spark Slim utilizes this technology, they have noted the device includes a “4.04mm thick, high-density battery.”
The Spark Slim is crafted from fully recycled aluminum through an integrated die-casting process, featuring a stainless steel unibody design. For fans of metal-bodied phones, this design choice may signal a welcome return to premium materials in the smartphone industry. However, the metal back may limit the potential for wireless charging, though it does support superfast 45W wired charging.
To enhance the perception of thinness, TECNO has incorporated a curved display, which contributes to a sleeker appearance. The 6.78-inch AMOLED panel offers a 1.5K resolution, a 144Hz refresh rate, and an impressive peak brightness of 4,500 nits. In terms of photography, users can expect a dual rear camera setup with two 50MP sensors and a 13MP front-facing camera, catering to photography enthusiasts.
While TECNO has not disclosed the specific chipset powering the Spark Slim, it has indicated that it will feature an “upcoming high-performance octa-core chip.” Given that the Spark lineup typically falls within the budget to mid-range category, it is anticipated that the processor will not be a flagship model. Currently, TECNO has not shared any pricing or availability details for the Spark Slim. In fact, the device is referred to as a “concept smartphone,” leading to speculation about its eventual commercial release.
As the smartphone industry evolves, my personal focus is not solely on the thinness of devices but rather on the significant shift towards high-energy-density batteries. If this trend continues, we may soon experience a future where multi-day battery life becomes standard for smartphones. Although major brands like Samsung and Google may take their time to adopt such innovations, it is refreshing to see companies like TECNO pushing the boundaries and leading the charge in battery technology.
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