this post was submitted on 10 Jan 2024
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Battery degradation isn't as much of a concern in these cases. Batteries that are designed for grid backup use a more resilient chemistry which makes them heavier, but also last longer.
Consumer whole home backup batteries advertise the batteries having over 90% capacity after 10 years.
In a grid storage application, 90% of the original capacity is still fine, and as other commenters have pointed out, the batteries are recyclable.