8.5. Storage and discharge
behaviour
Lithium ion cells self-discharge very slowly giving them
long shelf life.
Although the battery packs are protected against
unwanted self discharge it is advised to read the
following note concerning Li Ion battery pack
storage.
To maximize shelf life of your Li-Ion battery pack,
please take into account the following guidelines:
8.5.1. Store at low temperature
Storage temperature has the highest effect on self-
discharge. Higher temperatures increase self
discharge (Fig.1). Storage of cells and batteries in non-
temperature controlled facilities in hot climates can
cause quicker self discharge. Hence the storage
conditions affect the shelf life of the product
Fig. 8.5.1: Capacity degradation as a function of
temperature
8.5.2. Store at 50% charge
For maximum lifetime, we recommend to
charge the battery to approximately 50% of
its capacity before storing it for a long period
of time
8.5.3. Remove from unit for long
term storage
For long term storage, we recommend to
remove the Confidea
®
battery from the
conference unit, even if the unit is switched
off. As indicated in fig 2. and fig.3, self
discharging rate of the battery can be
reduced to approximately 1/3 when the
battery is removed from the unit
Fig. 8.5.3.1: Self discharge - inserted in Confidea WDU
Fig. 8.5.3.1: Self discharge - removed from Confidea WDU
Note:
Store at low temperature
Store at 50% charge
Remove from unit for long term storage
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