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G1  Introduction to AC500  1-40  AC500 / Issued: 07.2006 
Insertion of the battery: 
1.  Open the battery compartment by inserting a fingernail in the small locking mechanism, press it 
down and slip down the door. The door is attached to the front face of the CPU and cannot be 
removed! 
2.  Remove the TA521 battery from its package and hold it by the small cable. 
3.  Insert the battery connector into the small connector port. The connector is keyed to find the correct 
polarity (red = plus pole = above). 
4.  Bend the cable and insert first the cable and then the battery into the compartment, push it until it 
reaches the bottom of the compartment. 
5.  Arrange the cable in order not to inhibit the door to close. 
6.  Pull-up the door and press until the locking mechanism snaps. 
 NOTICE 
In order to prevent data losses or problems, the battery should be replaced after 3 
years of utilisation or 
at least as soon as possible after receiving the “Low battery 
Warning” indication. 
Don’t use a battery older than 3 years for replacement. Do not keep batteries too 
long in stock. 
Replacement of the battery: 
 ATTENTION 
In order to avoid any data losses (if needed), the battery replacement should be 
done with the system under power. Without battery and power supply there is no 
data buffering possible. 
1. Open the battery compartment by inserting a fingernail in the small locking mechanism, press it down 
and slip down the door. The door is attached to the front face of the CPU and cannot be removed. 
2. Remove the old TA521 battery from the battery compartment by pulling it by the small cable. Remove 
then the small connector from the socket, do this best by lifting it out with a screwdriver (see photo). 
 
3. Follow the previous instructions to insert a new battery. 
 ATTENTION 
 
Lithium batteries must not be re-charged, not be disassembled and not be 
disposed of in fire. They must be stored in a dry place. Exhausted batteries 
must be recycled to respect the environment. 
Please refer to chapter "Hardware/Accessories/TA521" for the technical data sheet of the Lithium battery 
TA521.