Canon PowerShot A580 2463B020 User Guide (en)

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If you store batteries for a long period of time (about 1 year), it 
is recommended that you deplete the batteries in the camera 
and to then store them at room temperature (0 to 30°C/32 to 
90°F) in low humidity. Storing them in a fully charged condition 
can shorten their lifespan or degrade their performance.
Again, if you do not use batteries for more than 1 year, fully 
charge them once a year and deplete them in the camera 
before storing them.
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If the battery usage time has become considerably low 
despite wiping the terminals and charging them until the 
battery charger indicator remains lit, this may indicate that 
the batteries have reached the end of their lifespan. Replace 
them with new batteries. If you are purchasing new 
batteries, look for Canon AA-size NiMH batteries.
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Leaving batteries in the camera or charger may result in 
damage from battery leakage. When not in use, remove the 
batteries from the camera or charger and store them in a 
cool, dry location.
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It takes approximately 4 hours 40 minutes for the charger to 
fully recharge the batteries after they have been depleted. 
When two batteries are placed on each side of the charger, 
recharging will take approximately two hours (as determined 
by testing at Canon facilities).
Charge batteries in an environment where the temperature is 
in the range of 0 to 35°C (32 to 95°F).
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The charging time varies according to the ambient 
temperature and to the battery charge state.
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The battery charger may emit noise while charging. This is 
not a malfunction.