Wrap a 1.4V alkaline 675 hearing aid battery in a correctly sized split washer to take up the empty space and there you have it; the best practical 625 replacement option. They are perfectly accurate and they are *dirt* cheap too. I buy them anywhere in multi packs of five for $3. I find them much more accurate, consistent, long lasting, and economical than Wein cells, which I used for years before a repairman tipped me off to the 675 method. Going this route not only gives better results, IMO, but also lowers the yearly cost per camera to about $1.20 (changing every six months), where it was about $24 per year per camera using Wein cells (changing every three months). With four Canon FD bodies, a Nikon F Photomic T, and a Canon FTb low light booster, I was going through Wein cells like mad, and results were all over the place. None of my cameras ever matched my spot meter or each other with Wein cells. Not so with the 675s.