In one example, a leadless implantable medical device (LIMD) generates a cathodal stimulation pulse with anodal recharge for delivery to patient heart tissues using the tip electrode and the anode electrode. The LIMD then verifies capture of the cathodal stimulation pulse and, if capture is not verified, delivers a cathodal backup stimulation pulse with anodal recharge using the tip electrode and the anode electrode. Automatic capture verification is thereby provided within an LIMD to allow for a reduction in the magnitude of stimulation pulses and to extend the lifetime of the device. In one particular example, the anode is a middle portion of a cylindrical case with a surface area sufficient to prevent anodal stimulation. Other portions of the case are coated with an electrically insulating material to render those portions substantially electrically inert. A voltage halver may be used to further reduce power consumption.
