Schiller America NP2.3-12FR AT-2, AT-2 Plus EKG Machine Battery
Replacement Biomedical Battery for Schiller America AT-2, AT-2 Plus EKG Machine.
This Sealed Lead Acid battery has a nominal voltage of 12.0V and a rated capacity of 2.3Ah.
EnerSys Genesis NP2.3-12FR
(generic but recognized brand)