Good news !!! it’s Maintenance free units, no need to spend more money. Just keep it clean and avoid from the water/mousier.
Your seller having customer support and help you out in this regard
Only batteries have to be change after 2/3 years that’s more then enough.
Stair Lift Energy Saving
Saving up to 80% energy Extending product life by 20% Green, environmental protection and low noise
Stair Lift Features Exceptional durability and constructional Lower power consumption Rapid battery charge with overcharge protection Smooth start, run and stop Diagnostic digital display (LCD)
Appearance Thin, Effective Space saving design Interchangeable seat and backrest upholstery Adjustable width armrest User friendly controls
Safety features User-friendly bi-directional switch multiple safety edges auto-stop features retractable seat belt Over speed control protection Keyed on/off switch :: prevents unauthorized use Anti-slip footrest Swivel and lock seat at top landing
Safety Over speed protection Motor overload protection Limit switch protection Anti-reverse protection Electrical and mechanical brake system