Abstract: The present invention discloses a novel drill bit system 100 having sealed chambers 330 located on the bit body 300. Batteries 350 and an electrical circuit board 352 are located in the chambers 330, including electronic data storage and sensors 354. An internal network of passages 332 connects the chambers 330. Data from the sensors 354 is stored on the data storage unit 352. A removable compact pulser 500 is locatable inside the bit body 300. The motor 522 of the pulser 500 is connectable to the circuit board 352 and batteries 350 through a portal 532 that passes through a centralizer fin 530 and aligns with an internal portal 334 connecting the interior of the bit body 300 to the interior of a sealed chamber 330. Drill bit 100 may be configured as a conventional drill bit, as a memory logging drill bit, or as an MWD drill bit.