Battery: unusually problem?

I'm afraid to change my battery , because I'm not sure that it has not been ruined by some other malfunction of my macbook pro.
In fact, the moi cycle counter tells me that the battery had only 30 complete cycles, and I have never been able to calibrate the battery because the computer turned off for lack of power rather than go to sleep .
The service said that instead everything is in order , but it was I stupid not to insist even more than I insisted.
Meanwhile, under apple care , my mac has been replaced the logic board for the famous defect in the graphics card.
However, the defect has remained unchanged to this day that the battery after only two and a half years of life in which he has never held more than twenty minutes.
I don't know what can be, and especially if it is wise to change the battery.
Currently my battery is down to zero , and my processor is running at half power (sigh) .
I do not want it ruined again to a hardware problem I do not know .
What can I do ?

Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new).  Try each of these in order until the issue is resolved.

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