Sold my Leicas, just found some batteries I kept on hand. They are unopened, in blister packs
I have 4 (four) Kodak CR1/3N and 2 (two) Energizer 2L76. These are the same battery, just different brand designations. I used them with perfect results in my M6 and M7. These are "double" batteries, used in place of the two smaller individual batteries. And you never wind up with an odd number and being just one short.
Amazon has them for $5.49 plus shipping.
Buy all 6 for $15, paypal and shipping included, COUSA only.