An apparatus comprising: an implantable medical device, comprising: a first electrostimulation energy delivery channel, comprising: a first electrostimulation voltage generator, configured to generate a first electrostimulation voltage; a first capacitor, coupled to the first electrostimulation voltage generator, and configured to be capable of storing the first electrostimulation voltage; and a first switching circuit, coupled to the first capacitor, configured to facilitate delivery of the first electrostimulation voltage from the first capacitor to a target; a second electrostimulation energy delivery channel, comprising: a second electrostimulation voltage generator, configured to generate a second electrostimulation voltage; a second capacitor, coupled to the second electrostimulation voltage generator, and configured to be capable of storing the second electrostimulation voltage; and a second switching circuit, coupled to the second capacitor, configured to facilitate delivery of the second electrostimulation voltage from the second capacitor to a target; characterised in that the implantable medical device further comprises a processor, configured to control configuration of the second capacitor to be in series with the first capacitor during delivery of the first electrostimulation voltage from the first capacitor to the target. an implantable medical device, comprising: a first electrostimulation energy delivery channel, comprising: a first electrostimulation voltage generator, configured to generate a first electrostimulation voltage; a first capacitor, coupled to the first electrostimulation voltage generator, and configured to be capable of storing the first electrostimulation voltage; and a first switching circuit, coupled to the first capacitor, configured to facilitate delivery of the first electrostimulation voltage from the first capacitor to a target; a second electrostimulation energy delivery channel, comprising: a second electrostimulation voltage generator, configured to generate a second electrostimulation voltage; a second capacitor, coupled to the second electrostimulation voltage generator, and configured to be capable of storing the second electrostimulation voltage; and a second switching circuit, coupled to the second capacitor, configured to facilitate delivery of the second electrostimulation voltage from the second capacitor to a target; characterised in that the implantable medical device further comprises a processor, configured to control configuration of the second capacitor to be in series with the first capacitor during delivery of the first electrostimulation voltage from the first capacitor to the target. a first electrostimulation energy delivery channel, comprising: a first electrostimulation voltage generator, configured to generate a first electrostimulation voltage; a first capacitor, coupled to the first electrostimulation voltage generator, and configured to be capable of storing the first electrostimulation voltage; and a first switching circuit, coupled to the first capacitor, configured to facilitate delivery of the first electrostimulation voltage from the first capacitor to a target; a first electrostimulation voltage generator, configured to generate a first electrostimulation voltage; a first capacitor, coupled to the first electrostimulation voltage generator, and configured to be capable of storing the first electrostimulation voltage; and a first switching circuit, coupled to the first capacitor, configured to facilitate delivery of the first electrostimulation voltage from the first capacitor to a target; a second electrostimulation energy delivery channel, comprising: a second electrostimulation voltage generator, configured to generate a second electrostimulation voltage; a second capacitor, coupled to the second electrostimulation voltage generator, and configured to be capable of storing the second electrostimulation voltage; and a second switching circuit, coupled to the second capacitor, configured to facilitate delivery of the second electrostimulation voltage from the second capacitor to a target; characterised in that the implantable medical device further comprises a second electrostimulation voltage generator, configured to generate a second electrostimulation voltage; a second capacitor, coupled to the second electrostimulation voltage generator, and configured to be capable of storing the second electrostimulation voltage; and a second switching circuit, coupled to the second capacitor, configured to facilitate delivery of the second electrostimulation voltage from the second capacitor to a target; characterised in that the implantable medical device further comprises a processor, configured to control configuration of the second capacitor to be in series with the first capacitor during delivery of the first electrostimulation voltage from the first capacitor to the target.