Home Battery Backup (e.g. Powerwall): lifespan, maintenance and replacement

Typical lifespan: 10–15 years (about 12 years).

Maintenance schedule

• Monitor charge cycles and capacity via app — Monthly
• Inspect for physical damage or leaks — Every 6 months
• Ensure ventilation around unit — Ongoing
• Update firmware — As available
• Professional inspection — Every 2–3 years

Signs it needs replacing

• Capacity dropped below 70% of original
• Frequent error codes
• System not holding charge
• Physical swelling of battery unit
• Manufacturer warranty expired and performance declining

Tips

Pair with solar panels for maximum value — batteries alone mainly provide backup, not savings.