I would be surprised if a battery has 5 yr warranty, either way low voltage causes lots of unrelated fault codes on all brands a new battery is easily the cheapest first action when you get this happening, especially important if you don’t have a warranty. Remember on most cars the BMS needs to be reset when you fit a new battery.
I’ve batteries last 8 yrs, also I’ve had them fail after 6 months, letting a battery go flat for more than a few days will permanently damage it.
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