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To protect the battery pack and prolong its life, do not charge it for
longer than 24 hours continuously.
• Since this is a lithium ion battery pack, you need not completely
discharge it before recharging. It can be recharged at any point.
However, since the maximum number of charge cycles is
approximately 300 times (battery life, based on Canon's testing
standards), you are recommended to charge the battery pack after
having discharged it completely to prolong battery life.
• It takes approximately 95 minutes to fully charge the battery pack
from a fully discharged state (based on Canon’s testing standards).
Charging it within a temperature range of 5° to 40 °C (41° to 104 °F)
is recommended.
• Charge times may vary according to the ambient temperature and
the battery pack’s charge state.
• You may hear a noise during charging. This is not a malfunction.
•See Battery Performance (p. 144).