Replace the Battery

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Prepare the host for battery replacement.
To correctly reset the date and time after replacing a battery, you must prevent the host from automatically powering on, and also disable any NTP server connections. Before you remove power from the server, perform these steps.
1. Check the AUTO_HOST_POWER_ON state. At the Oracle ILOM prompt:
```
-> show /SP/policy HOST_AUTO_POWER_ON

/SP/policy 
  Properties:   
     HOST_AUTO_POWER_ON = enabled
```
2. Set the property to disabled.
```
-> set /SP/policy HOST_AUTO_POWER_ON=disabled
```
3. Check the NTP server property for the /SP/clock.
```
-> show /SP/clock usentpserver

/SP/clock 
  Properties:   
     usentpserver = enabled
```
4. Set the property to disabled.
```
-> set /SP/clock usentpserver=disabled
```
Replace the battery.
Replacing the battery is a cold-service procedure. The server must be completely powered down before performing this procedure.
1. Prepare the server for service.
  See Preparing for Service.
2. To dislodge the battery from the retainer, gently push the battery toward the side of the server to release it from the retention clip.
3. Unpack the replacement battery.
4. Press the new battery into the battery retainer with the positive side (+) facing the side of the server.
5. Return the server to operation.
  See Returning the Server to Operation.
Reset the system clock.
1. Use the Oracle ILOM clock command to set the day and time.
  The following example sets the date to August 22, 2016, and the timezone to EDT.
```
-> set /SP/clock datetime=0812213202016 timezone=EDT
Set 'datetime' to '0812213202016'
Set 'timezone' to 'PEDT'

-> show -d properties /SP/clock
    
/SP/clock    
  Properties:      
     datetime = Mon Aug 22 13:20:16 2016      
     timezone = EDT (EST5EDT)      
     uptime = 2 days, 19:56:49      
     usentpserver = disabled
```
2. If the SP policy HOST_AUTO_POWER_ON was enabled before you replaced the battery, then it must be re-enabled.
```
-> set /SP/policy HOST_AUTO_POWER_ON=enabled
```
3. If the /SP/clock usentpserver property was enabled before you replaced the battery, you must re-enable it.
```
-> set /SP/clock usentpserver=enabled
```
Verify the battery.
Check the status of the system battery.
```
-> show /SYS/MB/BAT
```

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