Portege Z930 - high loss of battery capacity

I have the laptop since July, 2013. At the beginning I had good battery life, the battery has a duration of 6 hours, which, with the time declined to something, like 4 hours.
Now, I have been using the laptop plugged in for a while, and found out last week that I have a huge capacity loss, about 55%. The strange thing is that it's much worse in a few days, and now the loss is 77%.

In addition to buying a new battery (which I'll do in the future - btw, a tutorial on how to change it?), what can I do? This capacity loss is permanent? I've been measured it with a tool of acpi.

Thank you
Jose

Since the last post, the loss of high at 83 percent capacity. Any idea?

Tags: Toshiba

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