upsAdvConfigLowBatteryRunTime 1.3.6.1.4.1.318.1.1.1.5.2.8

The desired run time of the UPS, in seconds, once the low battery condition is reached. During this time the UPS will produce a constant warning tone which can not be disabled. For a list of allowed values supported by your UPS model, see the UPS User's Manual. If a value other than a supported value is provided in a set request, the UPS interprets the value as the next higher acceptable value. If the provided value is higher than the highest acceptable value, the highest acceptable value is used.