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Solution
Battery performance decreases at low temperatures. Warm the battery / batteries, such as by placing them in your pocket with the terminal cover on.
If the battery terminals are dirty, battery performance will decrease. Clean the terminals with a cotton swab and re-insert the battery / batteries several times.
If the batteries are consumed quickly at normal temperatures (23 deg C), the battery life might have been exceeded. Please replace the batteries with new ones.
Caution
When you warm the batteries in your pocket, please do not put them together with metal objects such as key chains. The batteries might short-circuit.
Please do not short-circuit the plus (+) side and the minus (-) side of the batteries with metal objects such as key chains.
When you are carrying the batteries or if they are not in use, please make sure to attach the terminal cover.