Lenovo Thinkpad Advance Ultrabay Battery II Handbuch Seite 6

Note: Note for Japan (JEITA guidance): Batteries are expendable
products. When a fully charged battery no longer provides sufficient
run time (in hours), it should be replaced. A battery used for more than
one year is a good candidate for replacement. Battery life is affected by
several factors such as recharge cycle count, temperature, system usage,
screen brightness, applications and other customer preferences. The
battery utility program included with your system can be used to
determine the current condition of the battery.
Note: The ThinkPad Advanced Ultrabay Battery II are shipped
partially charged to maximize shelf life. To maximize longevity of your
battery, you should fully charge it after receiving it. Batteries should
also be recharged at least twice a year. If the battery is stored with a
low charge for extended periods of time, the battery may become
unusable and might be disabled.
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ThinkPad Advanced Ultrabay Battery II User's Guide