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23.4 Checking Battery Performance
• Life expectancy of a battery depends on how frequent and how long it is used. When properly used,
the lithium-ion battery has a useful life of approximately two years. If improperly used, its life
expectancy can be shorten. It is recommended to replace the battery every two years.
• To optimize the battery performance, a fully discharged (or near fully discharged) battery should be
charged as soon as possible.
• Battery operating time depends on the equipment configuration and operation. For example,
measuring NIBP repeatedly will shorten the battery operating time.
23.5 Storing Batteries
• Remove the battery from the equipment if the equipment is not used for a prolonged time (for
example, several weeks). Otherwise the battery may overdischarge.
• Storing batteries at high temperature for an extended period of time will significantly shorten their
life expectancy.
• The battery storage temperature is between -20°C (-4°F) and 60°C (140°F). Storing batteries in a cool
place can slow the aging process. Ideally the batteries should be stored at 15 °C.