Just did a quick scan of Part II of the RCA Standing Orders and found that the following batteries were founded at Kemptville:
2 Feb 1920 - 25 Field Battery RCA;
1 Apr 1946 - 181 Light Anti-Aircraft Battery RCA;
The lineage for 30th Fd Regt indicates that it started as 8th Bde FA CA in 1905 and redesignated as 1st Bde CFA on 2 Feb 1920 on which date 25 Fd Bty was formed and assigned to it. (There was an earlier 25th Battery CFA [formed in Lethbridge 1908] and a 25th Battery CFA which was part of 6th Bde CFA of the CEF during WW1 --- I note that the nominal rolls for 6th Bde indicate it was raised in the Montreal region of Quebec so I don't think that there is [nor have I seen any reference to] a perpetuation between the two 25 Bties CFA and 25 Fd Bty RCA)
I note that 25th Fd Bty RCA was part of 30th Fd Regt's establishment in 1966 but had been switched to the Supplementary Order of Battle by 2000. No idea when the switch actually happened.
The info on 181 LAA Bty is even more sketchy and the Library and Archives Canada entry for the Guide to Sources relating to the Canadian Milita (Artillery) for the two batteries looks like this:
"25th Battery, CFA authorized but not organized (1st Brigade, CFA). Headquarters to be
at Ottawa (MD3), 2 February 1920.
Redesignated as 25th Field Battery but not organized, 1 July 1925.
Authorized to organize, 15 May 1928.
Placed on active service (18th Field Regiment), 10 May 1941.
Active unit converted and redesignated as 25th Medium Battery (2nd Medium
Regiment), 26 January 1942.
Active unit disbanded, 3 October 1945.
25th Medium Battery redesignated as 68th Medium Battery (active Force), 1 March
25th (Reserve) Field Battery amalgamated with the 51st (Reserve) Anti-Aircraft Battery,
type 4L, converted and redesignated as 25th Field Battery (30th Field Regiment), 1 April
Transferred from Ottawa to Kemptville, 31 March 1965."
"Authorized (60th Light Anti-Aircraft Regiment (Brockville Rifles)). Headquarters at
Kemptville, Ontario (MD3), 1 April 1946.
60th Light Anti-Aircraft Regiment, including 181st Light Anti-Aircraft Battery,
amalgamated with the 32nd Anti-Tank Battery (Self-Propelled) to form the 32nd
Locating Battery (Brockville Rifles), 1 September 1954."
Over to you OldSweat.