Marstek AAA 7018C rechargeable lithium-ion batteries are a four-piece set for devices that use AAA cells. Each battery provides 930 mWh of stored energy and a 1.5 V output, making the set suitable for everyday battery-powered equipment that accepts this cell format.
Charging is built into each cell through a USB-C port. The stated input is 5 V / 180 mA, so the batteries can be recharged directly by USB-C without a separate AAA charging cradle. Their stated capacity is 250 mAh.
Each cell measures 44 × 10 mm and weighs 7.3 g. The pack combines the familiar AAA format with direct USB-C charging for a rechargeable alternative to disposable cells.