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Keep recharging the battery on the plane,, switch to battery when there is a loss of power.

aren't most passenger planes in near continuous use, unless scheduled for repair or sold?

Define "continuous use". The ones used daily sit around about half the time in major airports' temporary parking areas away from the ramp.

a nuclear battery would last a few years.

Hopefully the radiation does not clear the memory…

We have software for that. /s

And finding the black boxes at a horrific crash would be easier. Just go in the direction that your Geiger counter makes the most clicks.