Maintenance services in the field of long-duration energy storage; installation, maintenance and repair of batteries; maintenance and repair of energy storage installations; preventative maintenance in the field of long-duration energy storage systems, namely, scheduled inspections, routine servicing, and replacement of wear parts; corrective maintenance, namely, troubleshooting, repairs, restorations, or replacements to return the system to normal operating condition; remote monitoring services, namely, real-time monitoring and alerts, advanced data analytics, customizable reporting/dashboards, advanced visualizations, machine learning integration, comprehensive log management, and resource management; updating of system and cloud software; updating of computer software; updating and maintaining cloud-based computer software through patches; technical support services, namely, multi-channel support (phone, email, live chat, self-service portal), 24x7 availability, remote assistance (remote desktop access, screen sharing), ticketing (incident management/tracking, prioritization, escalation), and customer feedback/customer satisfaction surveys; knowledge management (knowledge base, frequently asked questions, community forums); training and onboarding; service level agreements; performance contracting.