[mcronce]

This seems to have worked pretty well with the "core return" system on used 12V batteries for ICE vehicles. Even with a pretty small (usually $15-20 in my experience) financial incentive, people do tend to bring them in.

[ars]

It helps that they are heavy and annoying to dispose of, people are happy to let someone else take them instead.

[s0rce]

The battery pack in an EV is comparable: very heavy, large, dangerous voltages and chemical energy.