They may look like they are standard AA cells but that is only because they are the same size. The
internal structure is most likely quite different.

Nah, I'm pretty sure they're basically just rechargeable AA's when it comes right down to it. I've successfully replaced the stock cells with actual rechargeable AA's, and I've seen websites illustrating the same for various laptop batteries. There may be some obscure difference, but if AA's work, then they're the same by me. If it quacks like a duck, then it probably is.