6. Battery charge indicatorBatteries almost dischargedWhen the batteries are approximately 75% used, the batterysymbol will flash as soon as the instrument is switched on (ifat least one of the batteries still has some charge). Althoughthe instrument will continue to measure reliably, you shouldobtain replacement batteries.Batteries discharged – replacements requiredWhen the batteries are discharged, the battery symbol will flash as soonas the instrument is switched on. You cannot take any further measure-ments and must replace the batteries.1. Open the battery compartment at the bottom of the instrument.2. Replace the batteries – ensure they are inserted correctly, as shownon the symbols in the compartment.3. The memory retains all values although date and time must be reset –the year number will flash automatically after batteries are replaced.4. To set date and time, follow the procedure described in Section 4.2.Note:Use two new, Long-Life 1.5 V AAA batteries. Do not use batteries beyondtheir expiration date. If the monitor is not going to be used for a pro-longed period, the batteries should be removed.Using rechargeable batteriesYou can also operate this instrument using rechargeable batteries.• Please use only type "NiMH" reusable batteries.• If the battery symbol ( ) appears, the batteries must be removedand recharged. They must not remain inside the instrument, as theymay become damaged through total discharge even when switchedoff. The batteries must NOT be discharged in the blood pressure monitor.14