The Eufy S1 / S1 Pro Replacement Battery is designed to be used specifically with the Eufy S1 or S1 Pro. It is manufactured using high-quality battery cells. 

This Eufy S1 / S1 Pro Replacement Battery offers intelligent and comprehensive protection with real-time monitoring of current and temperature to ensure a reliable and durable lifespan. 

It is recommended to replace the battery approximately every 12 months to maintain effective vacuum operation. This is an authentic Eufy product.