no. get a better monitor or don't watch on your computer. that flaw is inherent to all lcd monitors. oled monitors do not have this problem, higher end lcd monitors mitigate it, but pixels will never be 100% opaque. actually, apple's...
so it is improving then. do not place a lot of confidence in ebay batteries, despite ratings. most sellers charge less, ship fast, and get good impressions and ratings that way. the buyers do not test for weeks before they leave...
If it's a generic battery that you probably bought off ebay, it most likely has several dead cells. If there was a warranty, get it replaced (though shipping will be as much as the battery cost). Try a couple of discharge cycles and see...
recommend matte if you're doing any type of graphic design. a good matte screen (ibm flexview, apple) handles color more accurately. of course, most laptop screens, matte or gloss, will not do this as well as a standalone monitor.
assuming that you mean the dongle might be stolen from the laptop while you are away from the laptop (I would never leave either alone in a car; you would just be asking for your windows to be smashed), why not just take the dongle with...
if the battery connection is not secure and there is no ac power, any moment that the laptop power is interrupted it will be off instantly. it won't show itself as a flickering screen or any type of half activity. I am betting it is the...
that's in the ballpark. again, different laptop models will have different capacities available, depending on the size of the battery and how many cells can be fitted into it. if you gave your laptop model, someone might be able to tell...