The BTI notebook battery offers reliable performance with lithium-ion technology that ensures a stable power supply. With a voltage of 11.58 V and a capacity of 3390 mAh, this battery is designed to keep your notebook running for extended periods without frequent recharging. It features a 3-cell design that enhances efficiency, providing a total energy capacity of 39.3 Wh. This serves as a replacement for the Lenovo L21L4P71, ensuring compatibility and dependable operation in your device. Trust in this battery technology to keep your productivity on track.