Maxwell K2 series BCAP3400 P285 supercapacitors.
3400 farads
2.85V
3.84Wh per cell
M12x1.75 threaded posts on either side for connections to build packs out of.
New old stock, have a tested capacity of 95% of original spec. ~3.5-3.6Wh expected.
Extremely high discharge and charge capacity.
TYPICAL APPLICATIONS
High shock and vibration environments
Automotive subsystems
Car Audio
Wind turbine pitch control
Hybrid vehicles
Rail
Heavy industrial equipment
UPS & telecom systems