A medical device includes a pulse generator that selectively generates pulses. A control module selectively controls the pulses. A power distribution system supplies power to said medical device. The power distribution system includes N batteries, where N is an integer greater than one, a common node, and N protection modules. The N protection modules communicate with the controlmodule, selectively connect a respective one of the N batteries to the common node based on control signals from the control module, and monitor current provided by the respective one of the N batteries. The control module generates the respective control signals based upon the current.一種醫療裝置，包括選擇性地生成脈衝的脈衝生成器。控制模組選擇性地控制脈衝。電力分配系統向所述醫療裝置提供電力。電力分配系統包括：N個電池，其中N是大於1的整數；公共節點；以及N個保護模組。N個保護模組與控制模組進行通信，基於來自控制模組的控制信號選擇性地將N個電池中相應一個連接到公共節點，並且監視由N個電池中相應一個所提供的電流。控制模組基於電流生成各自的控制信號。
