You actually do not have to do it now, it has always been *recommended* maintenance for all electronic devices. Update, clear the cache of any leftover temp and junk files that can interfere. Simple reboot once a week for optimization and also to clear out junk in the memory. Just because you didn't know about it or didn't do it, doesn't mean you shouldn't have. As phones got more sophisticated and updates more complex, it became more necessary to perform these functions.
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Check your battery usage statistics and see which apps are using the most battery resources, then check how much of that is background rather than actual usage activity. Make sure the worst offenders are optimized for battery usage or restricted or put to sleep.
Clearing the cache will help some with battery drain, as leftover bits and temp files trying to perform functions will use battery resources. Won't help as much as making sure your apps are optimized or sleeping. Sleeping apps are still usable, they just won't go crawling around in the background.
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