Deterioration after collision

A lorry ran into the driver’s side of my 2012 Leaf, damaged the door and the wing and ripped off the lower exterior front panel containing the Charge Port. When it was returned after repair, initially the Driving Range indicator showed 111 miles (despite the 80% charging limit) which reduced to 26 miles after a 10 mile journey. When charged, it showed a range of 65 eco-miles and 10 battery segments. And the regenerative braking is no longer working.

It has done 23,000 miles. Prior to the collision, it would show 85 eco-miles and 11 segments, and I drive in eco mode at a maximum of 50mph, have never let the battery go below a 20 mile range and always charged to a maximum of 80% (but I can’t prove it).

The insurer-appointed repairer told me the battery deterioration was due to its age. I have photos of the damage and can prove the battery went flat twice when it was with the repairers. Together with that and the nature of the actual damage can I demonstrate that the deterioration could have been caused by the collision or subsequent actions of the repairer (which is a coachworks firm, not an electric car specialist)?

Thanks for your help.

Welcome. Aside from letting it run dead, the repairers may have used a paint baking room to cure any new paint, roasting the battery in the process.

Thanks for your reply. I'd assumed that the white door, wing and front would have been painted before fitting, but I'll include this possibility in my email to the insurer.

GeorgeB said:

A lorry ran into the driver’s side of my 2012 Leaf, damaged the door and the wing and ripped off the lower exterior front panel containing the Charge Port. When it was returned after repair, initially the Driving Range indicator showed 111 miles (despite the 80% charging limit) which reduced to 26 miles after a 10 mile journey. When charged, it showed a range of 65 eco-miles and 10 battery segments. And the regenerative braking is no longer working.

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You could have stopped after that paragraph: way too many "flags"--not the least of which is you dropped a capacity bar (11->10) without even driving it. As was previously mentioned, I suspect the battery was heated/damaged in the paint process; this data is logged by the BMS (don't know if LeafSpy can read it).
When I had the bumper on my car replaced, I had to specify that I wanted it painted before it was put on the car...even if the paint didn't "match" (their warning).