Landmines of the future could be recharged remotely by drones

SUMMARY: Remote sensors exist where it is tedious, dangerous, or difficult for humans to regularly reach them. Those same characteristics make maintenance difficult, by design, and tax already-strained batteries to the edges of their lifespan. What if, instead of sending humans to maintain remote sensors, drones could fly close by and then, through radio waves, remotely recharge those same remote sensors?