The product was killed off due to being a failure ~2 years back. Presumably they don't want to manufacturer an alternative battery/alternative charger circuit a

The product was killed off due to being a failure ~2 years back. Presumably they don't want to manufacturer an alternative battery/alternative charger circuit and figure most people probably won't bother returning the drone as they forgot about it anyways so are just offering a full refund to anyone who remembers theirs even exists and is willing to mail it in as proof. OTOH they almost certainly don't want a bunch of defective batteries coming in the mail when the ultimate resolution they'd perform is the same as you'd perform locally.