T23 Ultrabay battery not recognized

[mindless]

Sorry about posting like this, I searched around on many terms, but I couldn't find what I wanted. Under WinXp, my ultrabay battery always show 0% (critical) condition and won't charge. My normal battery doesn't seem to have that problem, but it's annoying enough since my health bar will always show 49% maximum life (the average of my fully charged battery and the other one), since it's considering the other one as dead. Is there a way to correct this, or is this because some batteries aren't supported ?

By the way, I'm absolutely sure the battery isn't dead. It works fine on my t21.


Thanks
Samuel