How do you change the battery in a pentax k1000?
To change the battery in a Pentax K1000, locate the round battery cover on the camera's bottom plate. Use a coin to unscrew it counter-clockwise. Remove the old batteries and insert two fresh LR44 (or SR44/A76) batteries, ensuring the positive (+) side faces upwards. Screw the cover back on clockwise until snug. The light meter will then function.