Pentax ES ES Manual - Page 21

BATTERY CHECK AND REPLACEMENT A silver battery powers the TTL meter and electronic shutter. The power circuit is on only when you depress the shutter release (lightly for meter reading and completely for electronic shutter) with the shutter speed dial set at "AUTOMATIC". When not operating the camera, be sure to keep the shutter dial off the "AUTOMATIC" setting and set to the mechanical shutter setting, so that you can prevent wasteful consumption of the battery power with accidental touch on the shutter release button. The battery lasts about one year. To check its life, set the shutter speed dial at "AUTOMATIC", and push the black check button alongside the exposure factor control dial. If the meter needle drops to the notch facing "30", the battery has sufficient capacity. If it does not, replace the battery. (If you release the shutter at "AUTOMATIC" setting when the battery is dead, the shutter will operate at the mechanical shutter speed of 1/1000 sec.) For replacement, use Eveready #544 6V silver battery. Open the battery housing cover on the body front. When inserting, be sure that the (-) of the battery faces inward. Caution: Do not throw a dead battery into fire, as it may explode. Also, keep it beyond the reach of small children. 8 . 1100017 19