Used EV residuals are falling faster than expected

I've been tracking used EV prices for a few months and the drops are bigger than I expected. Three-year-old models are down noticeably year on year, and some dealers are sitting on stock for weeks. Meanwhile new registrations keep climbing in most markets, which feels contradictory. Is this just supply catching up after the lease wave, or are buyers genuinely hesitant about older batteries? I'd like to see actual residual value curves by model rather than headline averages, because the spread between brands looks huge. Anyone got data on which models are holding value best?