18Appendix C: Battery Longevity InformationThe longevity of the IPG battery depends on the following factors: Programmed settings, such as frequency, pulse width, amplitude, and number of activeelectrodes Program impedance Hours of stimulation per day Shelf life of the device between the dates of manufacture and implant Duration of communication sessions between the IPG and the patient controller or clinicianprogrammerTo estimate battery longevity manually, perform the following steps. For additional help withestimating battery longevity, contact Technical Support.1. Locate the energy factor for the desired stimulation parameters according to the leadimpedance in the tables in one of the following sections:- For IPGs using tonic stimulation parameters, see "Energy Factors for Tonic StimulationParameters" (page 19).- For IPGs using BurstDR™ stimulation parameters, see "Energy Factors for BurstDR™Stimulation Parameters" (page 23).NOTE: If the desired parameters do not appear in the tables, estimate the energy factor bychoosing a value between the listed energy factors for the closest parameters.2. For an IPG using multiple areas, determine the energy factor for each area from the previousstep, and add each of these values together.3. Use the figures in "Battery Longevity Graphs" (page 25) to determine the estimated batterylongevity by finding the energy factor from the previous steps on the curve for theappropriate model IPG.