- 1). Keep the Partner ACS system plugged into outlet power and turned on while replacing old batteries.
- 2). Push the battery icon on the battery compartment at the bottom of the processor unit, below the extension jacks.
- 3). Slide the icon up and over the "plus" icon to unlock the compartment.
- 4). Pull the tab at the bottom of the compartment to remove the battery casing.
- 5). Remove the old AAA alkaline batteries and insert two new ones. Push them straight in, making sure to place the negative and positive ends in the areas indicated.
- 6). Slide the battery case back into the ACS processor, with the locking latch in the unlocked position, far enough in that the edges of the casing are inside the unit and the compartment can close properly.
- 7). Press on the battery icon again, on the compartment door, and slide the latch down to close it.
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