Acer Aspire TC-780 Service Manual page 59

3. Gently push the RTC battery sideways (1), then lift it off the mainboard (2).
Note: WEEE Annex VII component. The RTC battery has been highlighted with the
yellow circle as shown above. Please follow local regulations for disposal of used
batteries.
Caution: Risk of explosion if battery is replaced by an incorrect type. Dispose of used
batteries according to the instructions.
Aspire TC-780 Desktop Computer Service Guide 51