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Even replacing a battery on the UPS systems does not require that the load on the UPS is turned off - this task can be performed quickly and easily by any member of staff to restore the unit to full use as soon as possible . Test your CO alarm at least once a month and replace the battery on battery-operated units at least once a year . Using small batteries in palmtops reduces their weight and improves their portability , but this requires the user to replace the batteries frequently . Replacing the battery and adjusting the position of the clip-on pick-up did not solve the problem which was later found to be due to a broken wire connection . Evan Thomas , reported to me , and replaced the battery commanded by Lieu tenant Woodruff .