LITHIUM ION (LIION) AND
LITHIUM POLYMER (LIPO)
CELL / BATTERY* SHELF LIFE
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Storage Temperature
°C
(
°F
)
4 0 %
Charge
1 0 0 %
Charge
0 °C
(3 2
°F
)
2% LOSS AFTER 1 YEAR 6% LOSS AFTER 1 YEAR
2 5 °C
(7 7
°F
)
4% LOSS AFTER 1 YEAR 20% LOSS AFTER 1 YEAR
4 0 °C
(1 0 4
°F
)
15% LOSS AFTER 1 YEAR 35% LOSS AFTER 1 YEAR
6 0 °C
(1 4 0
°F
)
25% LOSS AFTER 1 YEAR 40% LOSS AFTER 3 MONTHS
Table: LiIon / LiPo Battery Storage Temperature versus capacity
* If PCM or BMS is integrated within a battery pack, leakage current of the circuit needs to be taken in account.
STORAGE VOLTAGE:
A
fully charged LiIon / LiPo cell is approximately 4.2 volts.
LiIon / LiPo is different from other battery chemistries as it
should never be stored fully charged. LiIon / LiPo should be
stored approximately “half full” (40% – 50% of full charge)
TEMPERATURE:
LiIon / LiPo batteries function via a chemical reaction that
occurs inside their sealed enclosure. Providing power is
a chemical reaction, while the aging/degrading process is
another chemical reaction. Chemical reaction doubles its
speed for every ten degrees increase of ambient temperature.
Typical household refrigerator (37 to 40 degrees) is the
perfect storage place.
PERMANENT CAPACITY LOSS VS STORAGE CONDITIONS
STORAGE
RECOMMENDATIONS
To extend shelf life, cell / battery storage
voltage and storage temperature need
to be controlled.