In a Battery Management System (BMS), the efficiency of battery charging can be estimated using the formula:
where:
  • is the energy stored in the battery during charging (in watt-hours, Wh)
  • ​ is the total energy supplied to the battery (in watt-hours, Wh)
  • Efficiency is expressed as a percentage (%)
Write a function to calculate the charging efficiency of a battery given the stored energy and input energy.
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