What is a realistic timeframe for a battery to last? My wife has a 5S, had it about 3 years now and suddenly the battery life has gone to crap. She has no interest in ungrading to a newer phone ($$$) if possible so we are thinking of going the replacement battery route if it makes sense. Wondering it if it truly is the battery or if Apple has pushed out software updates that are essentially making the phone useless now.
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