Compatible for Tineco A11 Hero EX Tango Cordless Vacuum Cleaner Replacement Battery 21.6V 3500mAh Long-Lasting Lithium-Ion

- High capacity and long-lasting battery life: 21.6V 3500mAh large capacity lithium battery, 45% longer than the original battery life, supports A11 series vacuum cleaners for up to 60 minutes of continuous cleaning in standard mode - Widely compatible models: compatible with Tineco A11 Hero, A11 Hero EX, A11 Tango and other models, perfectly matched with detachable battery slots, installation without tools - Intelligent security protection: Built in lithium-ion battery management system, providing overcharge, overdischarge, and short circuit protection. The charging indicator light displays the status in real time (blue light charging/off, fully charged/flashing error) - Ready to use design: No need to activate the cycle, can be fully charged for the first time, optimizes the suction stability of the vacuum cleaner, and can handle various cleaning scenarios such as carpets and floors - Environmentally friendly and long-lasting: Lithium ion technology has no memory effect, can be used and charged as needed, with a cycle life of up to 500 times, extending the overall service life of the vacuum cleaner