Partner-18D Displaying " Replace System battery w/power"

[hanluc6933]

We have three Avaya Partner-18D phone sets that just started displaying "Replace System battery W/power". Has anyone seen this before or can anyone point me into the right direction for resolving this?

Thanks,

P

 

[allisland]

Time to replace the AAA batteries in the ACS

 

[hanluc6933]

Where and what is the ACS?
Thanks again.

 

[allisland]

It's the control unit for your Partner phones!!!!

 

[hanluc6933]

thanks.