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Not just mines, but sleeper drones with onboard AI that just sit there for decades due to an extra zero in a config variable before suddenly activating as if the war is still happening.
If this is a real and documented concern, please provide sources so I can take a look.
Otherwise, no, batteries will not hold a charge for decades. Landmines and unexploded ordinance are analog. They will last as long as the mechanisms and explosive payload aren’t damaged, or corroded.