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See this FAQ
IBM ThinkPad R52 1862 Battery
How to lengthen IBM ThinkPad R52 1862 Battery life
Properly preserve and comply with the following recommendations ,you will effectively lengthen battery life .
To use adapter to maintain battery power for the required journey.
purchase an additional battery.
when connected with the adapter, the IBM ThinkPad R52 1862 Battery should be installed in the laptop.this measure wil not cause over-charging. With rechargeable laptop control and protection circuit desig,nonce the battery is fully recharged,it will not charge again.
the best way to extend the life cycle time and lengthen the battery life is not to frquently plug adapter.
when the pc card is not used, please remove it fromthe pc card slot to avoid wasting electricity.
when the IBM battery ThinkPad R52 1862 is in the direct using condition, the number of its charging and discharging can reach about300 times.while over-charging and discharging will shorten battery life. the IBM ThinkPad R52 1862 Laptop Battery needs to be stored in the dry and cold place. The recommended storage temperature is 10-30°C. High ambient temperature could make battery pack rapidly self-discharge and reduce its using life.