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Battery has nothing to do with one window slowing down.
I wouldnt condemn weak motor just yet.
But i would spray some silicone on the window channels to help it out some.
It could be just dirt and gunk build up on the channels.
I use Honda 08798-9013 silicone grease and grease the track that the glass slide on. It works great. I also use it on my Sienna Van for the sliding door rubber seals and they has yet to freeze up this winter.
You have to reset the windows after replaced the baterry. Start from the rear passenger side roll all the way down and hold for 5 sec and roll up and hold 5 sec. repeat for all. Power on first. Please check your manual too. This is my old lexus rx330. See that help.