Leica M Instruction Manual page 145

Notes:
• The battery should be charged before the Leica M is used for the
first time.
• The battery must have a temperature of 10°-30°C to be charged
(otherwise the charger will not turn on, or will turn off again).
• Lithium ion batteries can be charged at any time, regardless of
their current charge level. If a battery is only partly discharged
when charging starts, it is charged to full capacity faster.
• The batteries warm up during the charging process. This is normal
and not a malfunction.
• If the two LEDs on the charger flash rapidly (> 2Hz) after starting
charging, this indicates a charging error (e.g. maximum charging
time exceeded, voltages or temperatures outside the permitted
ranges, or short circuit). In this case, disconnect the charger from
the mains and remove the battery. Ensure that the above
temperature conditions are met and then restart the charging
process. If the problem persists, please contact your dealer, the
Leica office in your country or Leica Camera AG.
• A new battery only reaches its full capacity after it has been fully
charged and – by use in the camera - discharged again 2 or 3
times. This discharge procedure should be repeated every 25
cycles. To maximize the life of the battery, it should not be exposed
to extremely high or low temperatures (e. g. in a stationary vehicle
in summer or winter) for long periods.
• Even when used in optimum conditions, every battery has a limited
service life. After several hundred charging cycles, this becomes
noticeable as the operating times get significantly shorter.
• The battery should be replaced after a maximum of four years, as
its performance deteriorates and reliable operation can no longer
be guaranteed, particularly in cold conditions.
• Defective batteries should be disposed of in line with the applicable
regulations (see p. 231).
• The replaceable battery provides power to a back-up battery which
is permanently fitted in the camera. This back-up battery retains
the set date and time for up to 2 months. If this back-up battery
becomes discharged it must be recharged by inserting the
replaceable main battery. Once the replaceable battery has been
inserted, the full capacity of the back-up battery is recovered after
about a few days. This process does not require the camera to be
turned on.
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