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Only qualified personnel should change them. Procedure WARNING: Do not replace the batteries when the ON-BATT LED is on. 1 Enable the manual bypass (Section 3.4). 2 Pop off and remove the front cover.. 3 Unscrew and remove the battery cover. 4 Remove the battery cartridge from the unit. Take note of the battery configuration and wiring. 5 Replace the batteries with any of the qualified batteries listed in Figure 3.4. 6 Push the cartridge with the new batteries back into the unit. 7 Reinstall the