Power up your devices with these high-performance 10440 lithium-ion rechargeable batteries. Each battery provides 3.7 volts and 750mWh capacity, making them ideal for various electronic devices. Note that these are specifically 10440 batteries, not AAA batteries. The package includes 4 rechargeable batteries and a versatile 4-in-1 USB Type-C charger for convenient simultaneous charging. The bright green-topped design makes them easily identifiable, while the included charging cable features multiple connectors for enhanced compatibility. These batteries offer a practical solution for your regular power needs, reducing the need for frequent battery replacements. The compact size and reliable performance make them suitable for various portable electronics and devices that support 10440 battery specifications. 10440 Lithium-ion Type-c usb rechargeable battery 3.7V Model Number: 10440 Material: Lithium-ion battery Charging Method: Type-C usb cable Charging Voltage: 5V Norminal Voltage: 3.7V Typical: 750mAh Diameter: 10 mm Height: 44 mm Weight: 21 (+-0.5)g Charging time: 1 hour (+-0.5) LED Indicators: Blink when charging,Stay on when full charged Short-circuited/over-flowed/over-charged/over-discharged protection: YES