What batteries do Kiev prisms take?
Older Kiev prisms take some sort of battery that was available in the Soviet Union but is now discontinued. Luckily an easy workaround is to use three 625A alkaline batteries or three LR44* batteries with a homemade spacer (a wad of aluminum foil) so that they will fit snugly. Newer prisms will accept three LR44 batteries without the aluminum wad. * Depending on your geographic location and brands available, other designations for this size of battery are: PX76A (Duracell), A76 (Eveready), KX625 (Kodak), LR44P (Maxell), V13GA (Varta). There are also two different types of longer lasting (more expensive) SR44 spec. silver-oxide versions designated as: 228 (Bulova), D357 or MS76 (Duracell), 357 or EPX76 (Eveready), KS76 or KA76 (Kodak), SR44W or SR44P (Maxell), SP357 or G13 (Panasonic), 357 or RS76 (Rayovac), V357 or V76PX (Varta).