“How many charges does it allow before having to need a recharge itself? It would be for a Samsung S21 Ultra”
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That is a great question, but it depends on how low your battery may be on your S21 Ultra. It can definitely take your phone to 85% if it was at, say, 20% on a full charge. Remember, it's not designed to be used as a normal charger; it's meant to serve as a backup when you cannot access an outlet.
Sorry, there was a problem. Please try again later.Less than 1 full charge. It gets my S22 (base version) from 0-85%.
Sorry, there was a problem. Please try again later.I use it so seldom but continuously so I only charge it every night .
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