A method of controlling wireless energy transfer from an energy transmission device to a wireless implantable device, the implantable device comprising: one or more energy receivers, configured and arranged to wirelessly receive a plurality of successive energy pulses, transmitted at a first power level; one or more energy storage modules, configured and arranged to store at least a portion of the energy received by the one or more energy receivers,; and an energy monitor, configured and arranged to monitor a status level of the one or more energy storage modules, wherein the status level is significantly affected by energy received by the implantable device and/or energy used by the implantable device; the energy transmission device comprising: one or more energy transmitters, configured and arranged to wirelessly transmit a plurality of energy pulses at the first power level; and one or more signal receivers, configured to detect sufficient energy signals (566, 2566) from the implantable device, wherein the energy transmission device is configured and arranged to pause energy pulse transmission immediately after a sufficient energy signal (566, 2566) is received; the method comprising: the energy transmission device starting energy pulse transmission at the first power level; the energy transmission device and the implantable device creating an energy transmission channel between the one or more energy transmitters and the one or more energy receivers; the implantable device transmitting a first sufficient energy signal (566, 2566) when the status level of the one or more energy storage modules exceeds a first maximum value; immediately after the first sufficient energy signal (566, 2566) is received, the energy transmission device pausing energy pulse transmission, with an intention to resume energy pulse transmission after a duration of a pause; and after the duration of the pause, subsequently resuming energy pulse transmission at the first power level when no further sufficient energy signal (566, 2566) is received. one or more energy receivers, configured and arranged to wirelessly receive a plurality of successive energy pulses, transmitted at a first power level; one or more energy storage modules, configured and arranged to store at least a portion of the energy received by the one or more energy receivers,; and an energy monitor, configured and arranged to monitor a status level of the one or more energy storage modules, wherein the status level is significantly affected by energy received by the implantable device and/or energy used by the implantable device; the energy transmission device comprising: one or more energy transmitters, configured and arranged to wirelessly transmit a plurality of energy pulses at the first power level; and one or more signal receivers, configured to detect sufficient energy signals (566, 2566) from the implantable device, wherein the energy transmission device is configured and arranged to pause energy pulse transmission immediately after a sufficient energy signal (566, 2566) is received; one or more energy transmitters, configured and arranged to wirelessly transmit a plurality of energy pulses at the first power level; and one or more signal receivers, configured to detect sufficient energy signals (566, 2566) from the implantable device, wherein the energy transmission device is configured and arranged to pause energy pulse transmission immediately after a sufficient energy signal (566, 2566) is received; the method comprising: the energy transmission device starting energy pulse transmission at the first power level; the energy transmission device and the implantable device creating an energy transmission channel between the one or more energy transmitters and the one or more energy receivers; the implantable device transmitting a first sufficient energy signal (566, 2566) when the status level of the one or more energy storage modules exceeds a first maximum value; immediately after the first sufficient energy signal (566, 2566) is received, the energy transmission device pausing energy pulse transmission, with an intention to resume energy pulse transmission after a duration of a pause; and after the duration of the pause, subsequently resuming energy pulse transmission at the first power level when no further sufficient energy signal (566, 2566) is received. the energy transmission device starting energy pulse transmission at the first power level; the energy transmission device and the implantable device creating an energy transmission channel between the one or more energy transmitters and the one or more energy receivers; the implantable device transmitting a first sufficient energy signal (566, 2566) when the status level of the one or more energy storage modules exceeds a first maximum value; immediately after the first sufficient energy signal (566, 2566) is received, the energy transmission device pausing energy pulse transmission, with an intention to resume energy pulse transmission after a duration of a pause; and after the duration of the pause, subsequently resuming energy pulse transmission at the first power level when no further sufficient energy signal (566, 2566) is received.