2025 might just be the year we see several ultra-slim phones hitting the market. Samsung has already teased the Galaxy S25 Edge, with a potential April launch on the horizon. Meanwhile, Apple is expected to unveil the iPhone 17 Air sometime later this year. But it looks like a lesser-known brand might actually beat both of them to the punch.
Ahead of MWC 2025, one of the biggest tech events in the world, Chinese brand Tecno revealed the Spark Slim – the world's thinnest smartphone, packed with a 5,200 mAh battery. At just 5.75 mm thick, it offers a massive battery and dual 50 MP cameras.
Spark Slim is... slim and with a big battery. | Image credit – Tecno
However, there's a catch: this phone is still just a concept. No official launch date has been given, and while demo units will be on display at MWC, there's a real chance this phone might never make it to store shelves as a real, commercially available product. After all, remember Tecno's ultra-thin tri-fold concept from last year? Yeah, that's still nowhere to be found.
The Spark Slim packs a 6.78-inch AMOLED display with curved edges, offering a sharp 1224p resolution and a smooth 144 Hz refresh rate. The company says it's also impressively bright, reaching a peak of 4,500 nits, and includes a 13 MP front camera for selfies. The 4.04mm thick battery supports 45W fast charging, and while the camera bump adds a little extra thickness, the phone remains surprisingly compact.
The phone has a dual back camera setup. | Image credit – Tecno
Actually, at just 5.75mm thick, this device indeed stands out as a real engineering achievement, especially when you consider the huge battery inside. For comparison, the upcoming Galaxy S25 Edge is rumored to be around 6 mm thick and will reportedly feature a smaller 4,000 mAh battery.
The answer lies in recent advancements in battery technology, specifically the adoption of silicon-carbon batteries. This new tech allows for higher energy density in a more compact design. For example, the OnePlus 13 used a similar approach to fit a massive 6,000 mAh battery without sacrificing its slim profile.
Tsveta, a passionate technology enthusiast and accomplished playwright, combines her love for mobile technologies and writing to explore and reveal the transformative power of tech. From being an early follower of PhoneArena to relying exclusively on her smartphone for photography, she embraces the immense capabilities of compact devices in our daily lives. With a Journalism degree and an explorative spirit, Tsveta not only provides expert insights into the world of gadgets and smartphones but also shares a unique perspective shaped by her diverse interests in travel, culture, and visual storytelling.
Recommended Stories
Loading Comments...
COMMENT
All comments need to comply with our
Community Guidelines
Phonearena comments rules
A discussion is a place, where people can voice their opinion, no matter if it
is positive, neutral or negative. However, when posting, one must stay true to the topic, and not just share some
random thoughts, which are not directly related to the matter.
Things that are NOT allowed:
Off-topic talk - you must stick to the subject of discussion
Offensive, hate speech - if you want to say something, say it politely
Spam/Advertisements - these posts are deleted
Multiple accounts - one person can have only one account
Impersonations and offensive nicknames - these accounts get banned
Moderation is done by humans. We try to be as objective as possible and moderate with zero bias. If you think a
post should be moderated - please, report it.
Have a question about the rules or why you have been moderated/limited/banned? Please,
contact us.
FCC OKs Cingular\'s purchase of AT&T Wireless
Things that are NOT allowed: