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A: The X1209 is compatible with 3.7V-rated batteries, such as 18650, 21700, 4680, and similar types, as long as they have a full charge voltage of 4.2V.

The default charging current is set to 2.1A and the charge cut-off voltage is 4.23V. Before connecting your battery to the UPS board, please carefully confirm the maximum charging current and voltage; exceeding the upper limit of the charging specification that the battery can withstand will not only cause adverse reactions, but may also cause irreversible damage.

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