Good quality ACER TravelMate 8371 8471 8571 Laptop battery
The effective capacity of a cell depends on the rate at which it is charged and discharged as illustrated in the
graph on Discharge Rates. This is because the electrochemical actions in the cell take a finite time to complete
and they can not follow instantaneously the electrical stimulus or load placed on the cell. This is explained in
the section on Charging Times. If a cell is subject to short term charging and discharging pulses, as in EV and
HEV applications, the chemical effect of a charging pulse may not be fully completed before the subsequent
discharge pulse starts to reverse the process. Even with coulomb counting this can lead to errors in determining
the SOC of the cell unless the rates of the chemical actions are taken into account.
ACER TravelMate 8371 battery detail:
Battery Type: Li-ion
Voltage: 10.8V or 11.1V
Capacity: 6600mAh / 9Cell
Weight: 377g
Size: 270.80 x 43.30 x 20.90mm
Color: White or Blue or Black
Stationary batteries were among the first to include monitoring systems, and the most common form of supervision
is voltage measurement of individual cells. Some systems also include cell temperature and current measurement.
Knowing the voltage drop of each cell at a given load reveals cell resistance. Cell failure caused by rising
resistance through plate separation, corrosion and other malfunctions can thus be identified. Battery monitoring
also serves in medical, defense and communication devices, as well as wheeled mobility and electric vehicle
applications.
ACER TravelMate 8471 battery Compatible original Battery Code:
ACER:
AK.006BT.027 AK.006BT.068 AS09D31
AS09D34 AS09D36 AS09D41
AS09D51 AS09D56 AS09D70
AS09D71 AS09D75 AS09D78 AS09F34
AS09F56 LC.BTP00.052
Let's do a little math to find out how much extra battery life you can get by spinning down the hard drive. A
typical laptop on the market today has a lithium-ion battery with a capacity of 40–90 Watt-hours of power,
which is good for two to four hours. Say we have a laptop with a battery of 50 Watt-hours. If the battery lasts
for 3.52 hours with the hard drive on, then we can calculate the average power usage as 40/3.5 = 13.3 Watts. Say
the laptop uses a typical laptop hard drive, which uses about 0.9 Watts in idle mode and about 0.32 Watts in
standby. In theory we can reduce the power usage by 0.62 Watts, to about 13.66 Watts. This increases battery life
to 40/13.7 = 3.5 hours and 38 minutes. The gain always depends on how much power you save relative to the total
power usage. In our example, the spindown saves about 5% of the total power, so the maximum gain in battery life
is about 5% as well.
ACER TravelMate 8571 battery Fit machine:
ACER TravelMate 8371 Series ACER TravelMate Timeline 8371 Series
ACER TravelMate 8471 Series ACER TravelMate Timeline 8471 Series
ACER TravelMate 8571 Series ACER TravelMate Timeline 8571 Series
If you want to play MP3s with your drive suspended, you can try increasing the READAHEAD setting in
/sbin/laptop_mode. Alternatively, you can copy a whole set of MP3s to a small tmpfs RAM disk. Make sure you don't
make the RAM disk so big that it gets pushed out to swap space or you defeat the purpose. A small RAM disk is
good for anything for which you don't want disk activity to occur—but only if your data isn't important.