1. lack of efficiency - only 80% roundtrip, much less than Lithium.
2. they go completely offline for periodic maintenance. This is done automatically by Redflow, but the loss of availability is problematic in some circumstances.
Lithium seems to have won the high efficiency niche, but there's probably room for lower efficiency flow type batteries as long as they're super cheap.
1. lack of efficiency - only 80% roundtrip, much less than Lithium.
2. they go completely offline for periodic maintenance. This is done automatically by Redflow, but the loss of availability is problematic in some circumstances.