Sonel KT-640, User Manual

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USER MANUAL 35
10.4. General rules of using Lithium batteries
If the device is unused for an extended period, remove the battery and store it separately.
The battery should be stored in dry, cool and well-ventilated place and it should be pro-
tected from exposure to direct sunlight. Optimal ambient temperature for long time storage
of the battery should be maintained below 30 Celcius degrees. If the battery is stored for
an extended period at a location with high temperature in it, then the chemical processes
occuring within it may shorten its expected life span.
Typical estimated life of Lithium-Ion battery is about 500-1000 charge cycles. Those bat-
teries reach their maximum capacity after being formatted (2-3 charge/recharge cycles).
The most important factor that influence the life of the battery is the discharge level (dis-
charge depth). The more discharged is the battery, the shorter is its life span. During nor-
mal operation camera works until reaching certain point of discharge. Reaching this point
is when the charging should be performed (in the camera or in external charger).
Memory effect occurs in Ion batteries in limited way. Those batteries can be charged even
when not reaching discharge level, with no serious consequences. It is important however
to perform full charging cycle once in a while during regular operation of the camera.
LiOn batteries continue to discharge at approximately 30% a month while in storage.
Keeping the batteries in high temperatures may even speed up this process twice. In or-
der not to allow extensive discharge ot the battery, after which formatting is necessary,
charge the battery once in a while (including the ones that are not being used).
Modern, fast chargers detect both too low and too high battery temperatures and react
appropriate. Too low temperature should prevent from starting the charging procedure,
which could irreversably destroy the battery. increase of the battery temperature suggest
that charging procedure is over and this is normal and expected phenomenon. However