Hi,
what you replace is not the CMOS, but the CMOS battery.
On an ACER from those years the CMOS battery looks like a coin, or a coin wrapped in plastic and connected to the motherboard.
On most models from same series the battery is located on the lower side of the motherboard, like on picture below:
On some model the battery may be located underneath the keyboard.
Here disassembly instructions for a similar model.
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