NEC Generation N3000 M760s User Manual page 40

How to Prolong Lithium-Based Batteries
A lithium-ion battery in use typically lasts between 18-24 months. Follow the below recommendations to
prolong your battery life cycle.
Initial Use or After Prolonged Storage Period
Your new battery comes in a discharged condition and must be charged before use. Upon initial use (or
after prolonged storage period) the battery may require two or three charge/discharge cycles before
achieving maximum capacity. To do so, unplug the AC adapter, turn off power management features
(through BIOS Setup- refer and Windows power management), and turn on the system. Once the battery
is discharged (maximum 95% depth-of-discharge recommended), plug in the AC adapter and recharge the
battery (without interruption).
Calibrating Regularly the Battery
Batteries should be calibrated by applying a deliberate full discharge once every month. Refer to
Use or After Prolonged Storage Period"
increasingly less accurate and in some cases, cut off the device prematurely.
Charging Lithium-ion Batteries
Except in situations described in
Regularly the Battery", avoid full discharge. The battery lasts longer with partial rather than full
discharges. It is recommended not to discharge it below 20%.
Note:
Under normal conditions, a lithium-ion battery provides 500-800 charge/discharge cycles.
Two 50% charges correspond to a single charge cycle (and not to two charge cycles). Therefore,
you can charge the battery more often; this will not reduce the battery life cycle.
Precautions for Recharging the Battery
Rechargeable batteries can be used under a wide temperature range. But this does not automatically
permit charging at these extreme conditions. The maximum allowable charge temperatures are between
0 °C and 45 °C (32 °F - 113 °F), 20 °C being the optimum one. Temperatures out of this range may
prevent charge or cut off the charge prematurely.
Storing Lithium-ion Batteries
If you do not plan on using the battery for a month or more, we recommend storing it in a clean, dry, cool
place away from heat and metal object. Ensure that it is wrapped protectively and nothing will be dropped
on it.
As a fully discharged battery may turn off its protection circuit, it is recommended to store it at 40%
charge (best by charging it than discharging it.) The battery should be re-installed every 3-4 weeks and
allowed a full discharge (refer to
storage for longer than this without using could cause the battery to fully discharge as the circuitry of the
battery itself consumes power and then, may cause failure.
Note:
Short battery life being mainly caused by heat rather than charge/discharge patterns, cool
storage (between 0 °C -20 °C) is more important than state of charge.
© 2007-2009, NEC Computers S.A.S. All rights reserved.
Discovering Your Computer
for the procedure. If ignored, the fuel gauge will become
"Initial Use or After Prolonged Storage Period"
"Initial Use or After Prolonged Storage
and "Calibrating
Period".) Leaving a battery in
40
"Initial