Exhibit 99.1

TSX TRUST COMPANY

VIA ELECTRONIC TRANSMISSION

August 27, 2025

TO ALL APPLICABLE EXCHANGES AND COMMISSIONS:

RE: ELECTRA BATTERY MATERIALS CORPORATION Confirmation of Notice of Record and Meeting Dates

We are pleased to confirm that Notice of Record and Meeting Dates was sent to The Canadian Depository for Securities.

We advise the following with respect to the upcoming Special Meeting of Security Holders for the subject issuer:

1	ISIN:	CA28474P7065
	CUSIP:	28474P706
2	Date Fixed for the Meeting:	October 9, 2025
3	Record Date for Notice:	September 8, 2025
4	Record Date for Voting:	September 8, 2025
5	Beneficial Ownership Determination Date:	September 8, 2025
6	Classes or Series of Securities that entitle the holder to receive Notice of the Meeting:	COMMON SHARES
7	Classes or Series of Securities that entitle the holder to vote at the meeting:	COMMON SHARES
8	Business to be conducted at the meeting:	Special
9	Notice-and-Access:
	Registered Shareholders:	NO
	Beneficial Holders:	NO
	Stratification Level:	Not Applicable
10	Reporting issuer is sending proxy-related materials directly to Non-Objecting Beneficial Owners:	NO
11	Issuer paying for delivery to Objecting Beneficial Owners:	NO

Yours truly,

TSX Trust Company

VANCOUVER 733 Seymour Street, Suite #2310 Vancouver, BC V6B 0S6   T 604 689-3334 CALGARY Telus Sky Building 2110, 685 Centre Street SW Calgary Alberta T2G 1S5   T 403 218-2800 TORONTO 301 - 100 Adelaide Street West Toronto ON M5H 4H1   Toll Free 1-866-600-5869 T 416 361-0930 MONTRÉAL 1701 - 1190, avenue des Canadiens-de-Montréal, C. P. 37 Montréal (Québec) H3B 0G7   T 514 395-5964