Macbook Pro Retina works off battery

[nassih]

hi everyone
i have a macbook pro 820-3462 works off battery but its charging cycle 136
voltage measured adapter not plugged and battery in charged 100%:
PPVBAT_G3H_CHGR_R :12.8v
CHGR_CSO_P :12.47v
CHGR_CSO_N :12.47v
SMBUS_CHGR_SDA : 3.4v
SMBUS_CHGR_SCL :3.4v
CHGR_RST_L : 3.38v
CHGR_BGATE: 5.5v
CHGR_PHASE : 12.47v
CHGR_UGATE : 12.25v
CHGR_SGATE : 12.15v
CHGR_CSI_N : 11.95v
CHGR_CSI_P : 12.18v

[mon2]

Re: Macbook Pro Retina works off battery

Sorry - what is the question?

charge cycle @ 136 means the laptop has been charged 136 times since it was sold by the factory. Apple batteries usually (not always) can be charged 500-1000 times before they need to be replaced.

[nassih]

Re: Macbook Pro Retina works off battery

tanks for reply
my question is why the motherboard cant work off batteries,the problem is the battery or something else?

[mon2]

Re: Macbook Pro Retina works off battery

See attached.

1) Start with reading the voltage on F7040, pin # 2 with external adapter attached. What is the voltage for PPBUS_G3H ?

2) Next, power down and remove the external adapter. Use the battery only.

List the voltages from the attached diagram.

Do you see the PPBUS_G3H with a similar voltage as supplied by the battery? (NO EXTERNAL adapter should be attached)