Adjustable seatpost

A seat post assembly for a bicycle, the seat post assembly comprising:

• a first tube having a first distal end;
• a second tube having a second distal end, the first tube and second tube movable relative to one another to establish a distance between the first distal end and the second distal end along a tube axis;
• a first chamber disposed in at least one of the first tube or the second tube;
• a second chamber disposed in at least one of the first tube or the second tube;
• a fluid flow path between the first chamber and the second chamber;
• an isolator to control the fluid flow path;
• an electronics module operable to move the isolator between a closed position closing the fluid flow path and an open position opening the fluid flow path;
• a cover covering the electronics module;
• and
• a battery pack including a battery and a battery shell, the battery pack providing power to operate the electronics module, wherein the battery pack is removably attached to the cover.