AC Adapter or Faulty Battery?

Thanks for the answers!

I will by same batter specs to be sure, but with what you say about the charger, means I can have the 65w flavour?

Thanks a bunch ans sorry for the rather later esponses

I'm terribly sorry for this long absence, work and all has prevented me to return back at you.

Well, first of all, this past days I have been dealing with some power outages at home, good opportunity to test the battery and see if it works. And I noticed this: After almost 2 years, the battery seems to last less than the first day (Used to last 3 hours working, now it lasts like 2 hours or 2 and a half hours). Now, with those power outages I have been able to test from 100% to 5% of remaining power.

So, answering to the question about charge rates, when it's on low power, it charges at about 15 or 20 Watts (charges a bit faster with a 65 watt charger I found, that is compatible with the specs you guys told me, it's steady at 18-20 Watt), as soon as it reaches 95% or so (probably 90%) the charge rate drops dramatically, at about 1 watt or less... Probably this is the reason why it tends to "discharge" and then charge very slowly when I do encodings or streams using the GPU.

Funny thing is that this last symptom happens with either the 45 Watt or the 65 Watt charger... Now Im hopping that the 65 watt charger at least gives me system stability (at least some things seem "faster" than before, dunno why).

Is this the normal behavior of a battery, or I need a new one?

Sorry again, and thanks a bunch!!