>>105712672 (OP)Because people can't be trusted.
Retarded people won't take care of them. They will corrode, rust break, whatever. You'll have tiny radiation spots all over from discarded batteries. Don't even try to tell me that in 10 years food grown in China or India won't have a distinct radioactive signature.
Smart people will just tear them apart and try to make bigger batteries or weaponize them. I'd bet money that within 6 months somebody has removed all the nuclear material out of a dozen of them and are using it to heavily irradiate copper bullets in a graphite box.