Eu suspeito que a bateria ou o carregador estejam com defeito. No entanto, antes de comprar um novo, a citação abaixo é para XP e eu não ofereço isso como resultado, mais um lugar para começar a procurar.
I noticed in PROCESS EXPLORER that, whenever i plug the power, it was only one occurrence of SERVICES.EXE to produce a big overload to CPU. This occurrenc of SERVICE.EXE is the one that supports PLUG&PLAY SERVICES and EVENT SERVICES. I started to focus the problem in another way: when my laptop works with batteries, XP throttle some process in order to lower power consumption and this hides the real problem. So I focused on this: what is throttled working in battery mode and consumes CPU in power plug mode?
The answer was quite simple: SERVICE.EXE was yet addressed, I excluded PLUG&PLAY and focused on EVENT SERVICES. I made a tour on EVENT VIEWER and it was simple to discover that SECURITY EVENT LOG had exceded the limits (it was set up for a maximum size of 512kB, but the real size was 80MB!!!). It was quite simple to clear the log in order to gain full CPU avalability (obviously I made a back up of the log).