A battery issue after adding books frequently means a problem with one of the books added. This can cause the import process to hang or leave something running that is using CPU and hence battery. Restarting the device will mean that process was killed or restarted. Finding the issue in the book an fixing it will solve the problem.
Though, with 4.31 there are other issues with connecting to a PC that might contribute to this. I don't remember if anyone reported this as a problem, but, the other issues might have hidden it. Updating to 4.32 is the best thing to do. From what I can see, this should be available as the update everywhere except maybe in Japan.
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