What you need to know • Realme's got a wild concept phone with a 15,000mAh battery, which is bigger than the batteries in an iPhone 12 through 16 combined. • The company claims it could last five days on a single charge, let you game for 30 hours straight, or even charge your other gadgets because it's basically a power bank with a screen. • That giant battery is just a proof-of-concept for now and isn't ready for mass production.

Chinese phone makers like Realme, Honor, and Oppo are using silicon-carbon anodes to push battery limits. The boldest example so far is Realme's new concept phone: it's surprisingly thin but holds an extremely huge battery.

At its recent 828 Fan Festival in China, Realme introduced two new concept smartphones. One of these devices features a huge 15,000mA

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