Supplementary Notes] Long-Term Storage Of Batteries - Canon CXDI-80C Service Manual

5.11 [Supplementary notes] Long-term storage of batteries

The characteristics of lithium-ion batteries are such that when the batteries are left standing in
storage for a prolonged period of time, their charging capacity decreases so they may end up
becoming unusable. The higher the temperature in the storage location, the faster the charging
capacity deteriorates. When the batteries become overdischarged, this deterioration progresses
at an even more significant pace.
Storage characteristics when the batteries are charged 40%
Storage Time taken to reach
temperature overdischarge region
60℃
40℃
25℃
0℃
Storage characteristics when the batteries are charged 100%
Storage Time taken to reach
temperature overdischarge region
60℃
40℃
25℃
0℃
* Based on the above characteristics, the batteries may become unusable when they have been
left standing in a storage temperature of 25 to 40°C for more than 1.5 years or so when
charged 40% or for more than 2.5 years or so when charged 100%.
Capacity deterioration characteristics after storage for 1 year
Storage temperature
60℃
40℃
25℃
0℃
* It is not possible to restore the capacity of batteries which has deteriorated as a result of
storage. After storage, the charging capacity will be reduced.
* When batteries with a 100% charge are left standing in a 25°C environment for one year,
their charging capacity will drop by about 10%.
* "100% charge" is the status in which charging with the battery charger is completed.
* Concerning battery control undertaken by the sales companies (or agents)
The batteries have a 100% charge when they are shipped from the manufacturing plant, and
the shipment date is entered on the packing labels. When batteries have been kept in the
inventory of the sales companies (or agents) for more than one year or when two years have
elapsed from the shipment date on the packing labels, the batteries must be 100% charged,
and the sales companies (or agents) must take responsibility for battery control.
1 . O v e r
1 . O v e r
Time taken to reach
deep discharge region
0.7 year
0.9 year
1.2 years
1.3 years
Time taken to reach
deep discharge region
1.2 years
1.9 years
2.3 years
2.5 years
40% charge
-22%
-10%
-3%
-1%
- 22 -
v i e w
v i e w
1.2 years
1.8 years
2.2 years
2.3 years
Overdischarge region: Cell voltage of 2.5 V or below
1.7 years
2.7 years
Deep discharge region: Cell voltage of 1.3 V or
3.3 years
below, no further charging possible
3.5 years
100% charge
-39%
-16%
-10%
-5%