Had my Ep121 for about 2 months now and the battery life is starting to make me regret my purchase. Upon reading more about Fujitsu q550, I feel that's a fit for me for my use. However, I really love inking on the ep121. I mainly use it for pdf annotation and Onenote and I cannot imagine my life without it. I've read about the external batteries, but no manufacturer seem to have the appropriate tip yet. Does anyone have any update on that? If not, I may have to sell my Asus and get the q550 instead.