New Minox 35 camera comes with two lithium CR 1/3N batteries.
Older Minox 35 (except ML ) uses 5.6 v mercury PX27
You may also use 6v silver oxide replacement for PX27, S27PX /SPX27
available from www.swssec.com
New Minox TLX /CLX comes with an adapter with four 1.5 v silver oxide 386 cells