I have Aspire “1300 mAh” (actually 1100 mAh) cell in mine and it seems to be fine, but the Aspire that I have is flat top. Also there are likely differences in cell lengths and I don’t know if the Aspire cell is “long” or “short” for its size. :stuck_out_tongue:

I have a couple of new Efest cells at home. I will try one later, when I get home from work.