3400mAh
This is only an example picture, which they do not always make new.

Much too expensive! 18650 batteries should be ordered directly from Asia. E.g. Panasonic 3.4Ah. We ordered 200, each one was ok and had more than the 3.4Ah (remeasured). You have to calculate with about 4-6CHF per cell.

Can I also use this battery instead of two CR123? Thickness is decisive!