Have you recently loaded any books onto your kindle? If so, the battery might be affected by stuck indexing, rather than the update. Go to the start page, do a search for "All Text" type in something silly light gslvp and tell it to search. If there are results, the reader is stuck indexing. Do a restart. If that doesn't help, you may have to delete the stuck book.
That's assuming you do have indexing issues, which play havoc with battery life.
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