The battery ages with time being. In scenarios when the running time becomes very short, you might need to replace the battery.

For RoboVac 11, 11C, 11S, 11S PLUS, 11S MAX, 12, 15C, 15C MAX, 15T, 25C, 30, 30C, 30C MAX, G10 Hybrid, G20, G20 Hybrid, G30, G30 Verge, G30 Edge, G30 Hybrid, G32 Pro, G40, G40 Hybrid, G35+, G40+ and G40 Hybrid+: RoboVac replacement battery for Bounce and G series RoboVac
How to Replace RoboVac's Battery (for Bounce series and G series)

For RoboVac X8 and X8 Hybrid: RoboVac Replacement Battery for X8 Series
How to Replace the Battery for X8 RoboVac Series

For RoboVac LR30 Hybrid, LR30 Hybrid+, L35 Hybrid, L35 Hybrid+, LR20: RoboVac Replacement Battery for L35/LR30/LR20 Series
How to Replace the Battery for L35/LR30/LR20 Series

For HomeVac S11 Go, S11 Infinity, S11 Reach:
https://us.eufy.com/products/t2973011
https://us.eufy.com/products/t2973021

For HomeVac S11 Lite:
https://us.eufy.com/products/t2983111

For HomeVac H30 series:
https://us.eufy.com/products/t2522111-80

If you need further assistance, please email eufy support.