arrying around a heavy plastic brick just for a single emergency smartphone top-up is a hassle nobody misses. Startup Oztech Lab has launched a crowdfunding campaign for the Core Power Bank S—a portable battery that looks more like a thick credit card than a bulky power pack. Measuring just 5.8 mm thick and weighing a mere 78 grams, it slips into virtually any pocket unnoticed. Inside sits a 5,000 mAh semi-solid-state cell capable of delivering up to 22.5W of output, alongside a gentle 5W low-current mode tailored for wireless earbuds. The package also includes a short, lightweight USB-C cable.
The standout real-world feature is its carbon-fiber chassis, paired with full IPX7 water resistance and rated freeze tolerance down to -20 °C. In practice, this eliminates the constant dilemma of where to stash a bulky battery when wearing light summer clothes or slim-fit jeans. But manage your expectations: 5,000 mAh will not power a week-long trek; it is purely daily insurance. Oztech Lab is straightforward about its real-world yield: the capacity provides exactly one full charge for an iPhone Air or a standard iPhone 16 Pro, while a hungrier iPhone 16 Pro Max will reach roughly 72%.
During the crowdfunding phase, the ultra-slim pack is priced at $32, with the retail tag eventually climbing to $49. At $32, trading mammoth capacity for featherlight portability makes total sense if you want backup power without sagging pockets. The only sobering catch is the shipping schedule: deliveries are slated for November 2026, meaning early backers will have to wait a while to actually pocket it.