Battery

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  • SC sends commands periodically specifying the (minimum) boost converter output voltage.
    • boost converter is not normally active or switching
  • battery terminals are not normally live. thus impossible to externally short.
  • external power enabled when battery inserted into ankle
    • micro power hall sensor senses magnet and enables BAF
    • high impedance source that is 'shorted' when connected to ankle and enables BAF
    • BAF 'soft starts' ankle - avoiding inrush current
  • low voltage (fuel gauge) shutoff - each cell voltage monitored
  • fuel gauge : micropower current sensor that integrates (dis)charge


  • electronic fuse : SC sends commands periodically that specify the maximum amount of current and/or power allowed.
  • internal charger and ballancer
    • inductive charging.