battery indicator always says 50%

Battery Information:

Model Information:

Serial Number: 9G00604JH8VNC

Manufacturer: DP

Device name: bq20z451

Pack Lot Code: 0000

PCB Lot Code: 0000

Firmware Version: 0003

Hardware Revision: 0002

Cell Revision: 0100

Charge Information:

Charge remaining (mAh): 2134

Fully charged: No

Charging: Yes

Full charge capacity (mAh): 4579

Health Information:

Cycle count: 425

Condition: Normal

Battery Installed: Yes

Amperage (mA): -139

Voltage (mV): 12527

System Power Settings:

AC Power:

System Sleep Timer (Minutes): 10

Disk Sleep Timer (Minutes): 10

Display Sleep Timer (Minutes): 10

Wake On AC Change: No

Wake On Clamshell Open: Yes

Wake On LAN: Yes

Current Power Source: Yes

Display Sleep Uses Dim: Yes

Battery Power:

System Sleep Timer (Minutes): 10

Disk Sleep Timer (Minutes): 10

Display Sleep Timer (Minutes): 2

Wake On AC Change: No

Wake On Clamshell Open: Yes

Display Sleep Uses Dim: Yes

Reduce Brightness: Yes

Hardware Configuration:

UPS Installed: No

AC Charger Information:

Connected: Yes

ID: 0x0100

Wattage (W): 60

Revision: 0x0000

Family: 0x0085

Serial Number: 0x0074dd52

Charging: Yes

The battery report you post indicates that the battery is charged to 46.6%, or 47% as the system will roung off. Other battery information is normal, voltage is where it should be, in the 12 to 12.5 volts range.

A word about "conditioning" that does not condition the battery...the procedure of discharging to shutoff and then recharging is done to condition the charge reporting circuitry builtin to Lithium-Ion batteries. Not condition the battery itself. That procedure is not good to follow on a regular basis as it will significantly shorten the life of a Lithium-Ion battery.

Data published by the independent group Battery University shows that deep discharging and charging will reduce the life of the battery to about 10% of the expected normal life. The optimum discharge/charge behavior is to only discharge to 50% and then recharge, number of charge cycles the battery will handle is ten times that of the deep discharge pattern.

Your battery shows 425 charge cycles, that is about the life of a battery that has been subjected to deep discharging history. And about half the life projected by Apple for the batteries they are now installing.

Go to this siteif you want to see the effect of charge cycle depth on Lithium-Ion battery life.