It's more likely the battery manufacturer needs checking - not the alternator, judging by this comment on a Lion battery this user comment on Amazon.
Utter Rubbish - my advice, buy a decent known brand
25 February 2019
Thank goodness for the 3 year warranty. Had two of these now, one conked outside of warranty and the second at just over two years. With brands such as Bosch and Varta lasting in excess of 10 years you would only buy one of these if you were wanting to get rid of a car which currently had a duff battery.
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