Battery status indicator compensating for battery voltage recovery

A computer-readable medium having processor-executable instructions, which when executed by a processor cause the processor to perform a process for determining a recovery voltage associated with a battery, the process comprising:

• detecting a transient increased current draw event that draws current from the battery at a current level that is greater than a steady-state average current level, the transient increased current draw event starting at a start time and ending at an end time;
• obtaining a first measured battery voltage at a first measurement time after the end time;
• obtaining a subsequent measured battery voltage at a subsequent measurement time after the first measurement time;
• and
• determining the recovery voltage by determining whether the difference between the first measured battery voltage and the subsequent measured battery voltage is less than a specified voltage change.

An implantable pulse generator (PG) device operable to stimulate an organ, the PG device comprising:

• a battery;
• a power sink drawing current from the battery at a steady-state level when a high current function is deactivated and drawing current from the battery at an increased level when the high current function is activated, wherein drawing current at the increased level causes a drop in battery voltage and a subsequent return to drawing current at the steady-state level causes an increase in battery voltage toward a recovery voltage;
• a control module controlling the power sink and triggering a transient increased current draw event comprising drawing current at the increased level for a time period followed by drawing current at the steady-state level;
• and
• a status indicator module detecting the transient increased current draw event and waiting a minimum time duration after the transient increased current draw event to determine the recovery voltage using a battery voltage measurement.

A system comprising:

• a power sink requiring power to operate;
• a battery delivering increased current to the power sink at a specified time, wherein delivery of increased current to the power sink causes a drop in battery voltage and a subsequent voltage recovery;
• and
• means for determining a recovery voltage using a battery voltage measurement, wherein determining the recover voltage includes computing a rate of change of voltage during the voltage recovery.