Dell Precision M40 - Manual (Page 3)

l The battery ’s self-test capability alerts you to battery conditions such as low charge.
l The battery has a life span of around 400 discharge/charge cycles, provided it is charged at normal room temperature.
l
When you activate standby mode, the computer can run on a fully- charged battery for approximately one week.
l If you are going to store the computer, disconnect all devices and turn off the computer. Remove the battery when you store your computer for
an extended period of time. A battery will drain when not in use during prolonged storage. After a long storage period, recharge the battery
fully before you attempt to run your computer from the battery.
l Do not dispose lithium ion batteries with common household waste products. See " Battery Disposal " for more information.
l Lithium-ion batteries are longer lived than conventional batteries and do not require replacement as often. You can charge the lithium ion
battery whenever you like without fear of reducing its charge capacity. You do not need to drain a lithium ion battery completely before
recharging it.
Removing a Battery
NOTICE: If you choose to replace the battery with the computer in standby mode, you have up to 4 minutes to complete the battery
replacement. After 4 minutes, the computer shuts down and you will lose any unsaved data.
1. Ensure that the computer is turned off, suspended in a power management mode, or connected to an electrical outlet.
2. If the computer is docked, undock it.
3. Close the display and turn the computer over.
4. Slide and hold the battery bay (or module bay) latch release on the bottom of the computer, and then remove the battery from the bay.
Installing a Battery
Slide the battery into the bay until the latch release clicks.
Checking the Battery Charge
Press the battery test button next to the lights. The number of lights that appear shows an estimate of the remaining battery charge.
Battery Charge Gauge and Test Button
Lights Charge Remaining (%) or Description