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Almost all pickups are passive
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Exception (notable ones, btw) are EMGs and Magnetics: both build
active PUs that can be dropped in as replacement and the 9 volts battery will be hidden into the control cavity. Easy mod and radical change for your bass.
Years ago I installed a couple of EMGs in an old MIM J and the sound was "devastatingly modern and present": sort of "bass in your face".