Leica M Instruction Manual page 233

FOR ThE BATTERY
Rechargeable lithium ion batteries generate power through internal
chemical reactions. These reactions are also influenced by the
external temperature and humidity. Very high or low temperatures
reduce the life of the battery.
• Always remove the battery if you will not be using the Leica M for a
long period of time. Otherwise, after several weeks the battery
could become totally discharged, i.e. the voltage is significantly
reduced, as the Leica M uses a low no-load current even when it is
turned off (e. g. for storing the date).
• Lithium ion batteries should only be stored in a partially charged
condition, i.e. not completely discharged or fully charged (in the
corresponding display in the monitor). For very long storage
periods, it should be charged up for around 15 minutes twice a
year to prevent total discharge.
• Always ensure that the battery contacts are clean and freely
accessible. Whilst lithium ion batteries are proof against short
circuits, they should still be protected against contact with metal
objects such as paper clips or jewelry. A short-circuited battery
can get very hot and cause severe burns.
• If a battery is dropped, check the casing and the contacts
immediately for any damage. Using a damaged battery can damage
the Leica M.
• In case of noise, discoloration, deformation, overheating of leaking
fluid, the battery must be removed from the camera or charger
immediately and replaced. Continued use of the battery results in a
risk of overheating, leading to fire and/or explosion.
• In case of leaking fluid or a smell of burning, keep the battery away
from sources of heat. Leaked fluid can catch fire.
• A safety valve in the battery guarantees that any excess pressure
caused by improper handling is discharged safely.
• Batteries have only a limited service life. We recommend replacing
them after around four years.
• Take damaged batteries to a collection point to ensure correct
recycling.
• The batteries may not be exposed to heat, sunlight, humidity or
moisture for long periods. Likewise, the batteries may not be
placed in a microwave oven or a high pressure container as this
results in a risk of fire or explosion.
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