what's wrong on my mac :(

[siuming]

hello guys,

yesterday, my mac suddenly shut down.
i power up and it run but it shut down immediately.
i have tried many times and it still doesn't work.
i plug in the charger, it's work!
when i plug out the charger, it shut down immediately :(
i have checked the battery is full

now, i can use it without charger but it may shut down immediately...

what's happen on my mac...?

[NewMacbookPlz]

Sounds like poor contact between the battery and the contacts on the case.

[Pax]

Try resetting the SMC, the Apple website will tell you how

Also look in About This Mac > More Info > Power

Does it say battery installed - Yes?
Under battery health it should say "normal" & a cycle count. What does yours say?
What does it say for Full Charge Capacity?

[siuming]

Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 3521
Remaining Capacity (mAh): 3041
Amperage (mA): 1452
Voltage (mV): 11915
Cycle Count: 1558

[Pax]

Almost certainly a bad battery.
Under battery health it should say "normal" if yours says "Check battery" that's a bad battery.

You have 1558 cycles, that's a really old, really tired battery. Apple says they will go for 1000 cycles.

Also your voltage and max capacity are very low. Bad battery.

[siuming]

therefore i think i may buy a new battery...

also, i have use "battery health monitor" this application.

it say that my battery life is gone....

p.s. my mac is bought from 2007...:(