librenms-librenms/includes/discovery/charge/apc.inc.php

<?php

if ($device['os'] == "apc")
{
  $oids = snmp_get($device, "1.3.6.1.4.1.318.1.1.1.2.3.1.0", "-OsqnU", "");
  if ($debug) { echo($oids."\n"); }

  // Try High-Precision First
  if ($oids)
  {
    echo("APC UPS Battery Charge High Precision");
    $type = "apc";
    list($oid,$current) = explode(' ',$oids);

    $precision = 10;
    $sensorType = "apc";
    $current_oid   = "1.3.6.1.4.1.318.1.1.1.2.3.1.0";
    $index         = 0;
    $current_val   = $current / $precision;
    $limit     = 100;
    $lowlimit  = 0;
    $warnlimit = 10;
    $descr     = "Battery Charge";

    discover_sensor($valid['sensor'], 'charge', $device, $current_oid, $index, $sensorType, $descr, $precision, '1', $lowlimit, $warnlimit, NULL, $limit , $current_val);   
  } else {  // Try to just get capacity
    $oids = snmp_get($device, "1.3.6.1.4.1.318.1.1.1.2.2.1.0", "-OsqnU", "");
    if ($debug) { echo($oids."\n"); }

    if ($oids)
    {
      echo("APC UPS Battery Charge");
      $type = "apc";
      list($oid,$current) = explode(' ',$oids);

      $precision = 1;
      $sensorType = "apc";
      $current_oid   = "1.3.6.1.4.1.318.1.1.1.2.2.1.0";
      $index         = 0;
      $current_val   = $current;
      $limit     = 100;
      $lowlimit  = 0;
      $warnlimit = 10;
      $descr     = "Battery Charge";

      discover_sensor($valid['sensor'], 'charge', $device, $current_oid, $index, $sensorType, $descr, $precision, '1', $lowlimit, $warnlimit, NULL, $limit , $current_val);
    } 
  }
}

?>