Although BADs normally have 55,760 RBE (98,360 when Fortified), the health of all MOAB-Class Bloons increases with each round after round 81, so the actual RBE of the BAD on round 100 is 67,200 (429,920 for Fortified BAD on Round 140). Like all MOAB-class Bloons, a BAD has four damage phases.
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First Strike can instantly destroy the BAD on round 100 if it has taken at least 24,578 damage first (21,092 if Big Bloon Sabotage is enabled).
A BAD's last damage phase (when its left and right turbines are destroyed) is an indicator that it is near this damage threshold. With Big Bloon Sabotage, the BAD reaches its final phase once it has taken 20,160 damage (22,400 without).