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Most black holes (BHs) will absorb a neutron star (NS) companion fullyintact, without tidal disruption, suggesting the pair will remain dark totelescopes. Even without tidal disruption, electromagnetic luminosity isgenerated from the battery phase of the binary when the BH interacts with theNS magnetic field. Originally the luminosity was expected in high-energy X-raysor gamma-rays, however we conjecture that some of the battery power is emittedin the radio bandwidth. While the luminosity and timescale are suggestive offast radio bursts (FRBs; millisecond-scale radio transients) NS--BH coalescencerates are too low to make these a primary FRB source. Instead, we propose thetransients form a FRB sub-population, distinguishable by a double peak with aprecursor. The rapid ramp-up in luminosity manifests as a precursor to theburst which is $20\%-80\%$ as luminous, given 0.5~ms timing resolution. Themain burst is from the peak luminosity before merger. The post-merger burstfollows from the NS magnetic field migration to the BH, causing a shock. NS--BHpairs are especially desirable for ground-based gravitational wave (GW)observatories since the pair might not otherwise be detected, withelectromagnetic counterparts greatly augmenting the scientific leverage beyondthe GW signal. Valuably, the electromagnetic signal can break degeneracies inthe parameters encoded in the GW as well as probe the NS magnetic fieldstrength, yielding insights into open problems in NS magnetic field decay.

Fast Radio Bursts and Radio Transients from Black Hole Batteries