Canon EOS 5000 - Manual (Page 7)

Precautions
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LCDs also respond more slowly at lower temperatures and can turn black
at high temperatures of 60°C. If restored to a regular temperature, they
will operate as normal.
Lithium Batteries
Two CR123A/DL123A lithium batteries must first be correctly installed for
the camera to operate. Please check the battery level in the following
instances;
(1) when you replace the batteries
(2) when the camera has not been used for an extended period
(3) when the shutter will not release
(4) when you are taking photographs in very cold temperatures
(5) when taking particularly important photographs
• When loading batteries into the camera, check that the battery contacts are clean and
avoid smearing them with finger-prints. This is to prevent poor contact and battery
drain.
• Batteries can be extremely dangerous if disassembled, recharged, exposed to high
temperatures, shorted, or disposed of in fire.
• While these batteries can serve well at low temperatures, the performance will drop off
considerably below the freezing point. When using the camera in cold temperatures,
keep a set of batteries warm in your pocket and install them just before you take your
photographs.
Using the Camera on Low Power
Even when the symbol on the LCD panel blinks, correctly exposed
photographs can still be taken when the shutter is released. However,
auto film advance and automatic rewind may be impossible. Please
replace the batteries with new ones.
Electronic Contacts
When removing the lens, be sure not to damage the electronic contacts
and the lens surface. Hold the lens with the contacts facing upwards.