I still remember the days when carrying a power bank felt like carrying an extra wallet. If you forgot it, you’d spend half the day looking for a wall socket. That’s why this new realme 15000 mah battery phone showcased at the 828 Festival instantly grabbed my attention. It’s not even a commercial model yet, just a concept, but the idea alone already feels wild.

A Battery That Sounds Unreal

Fifteen thousand milliamps. The number itself sounds more like a laptop than a slim pocket device. Realme says this concept phone can pull off up to 5 days of mixed usage, 30 hours of gaming, or even 3 months of standby. Imagine a road trip where you never even think of charging, or bingeing an entire web series season without a low-battery warning popping up.

👉 The 15,000mAh battery uses a 100% silicon anode for high energy density, but swelling issues keep it a concept for now. It’s a peek at the future, but one that hasn’t fully arrived.

Slim But Not Bulky

Here’s what surprised me most. Despite tripling the capacity of something like a Galaxy S25 Ultra, the phone is just 8.89mm thick. I’ve used chunky “battery phones” before and they always felt like carrying a small brick, but this one looks closer to a flagship. Sleek, modern, no rugged bulk.

Specs in Short

• 15,000mAh silicon anode battery
• MediaTek Dimensity 7300
• 12GB RAM + 256GB storage
• 6.7-inch display
• Reverse wired charging via USB-C

More Than Just a Phone

Realme even teased that this device could reverse charge other gadgets — a drone, another phone, even something as quirky as a mini fridge. It’s like having a power bank cleverly hidden inside a premium smartphone shell.