1N5231B

In the work has not yet checked, positioned by the seller as a module for one can 18650, according to the additional information, the module gives a charging current of 1 ampere, this means that they can safely charge any battery with a capacity of 2000 mah and above (2ah, means charging current = half capacity, 1a) And accordingly, the charging time in the watch will be equal to the capacity of the battery in amperes (in fact a little more, a half or two hours for every 1000 mah). By the way, the battery can be connected to the load already during the charge, which is sometimes very necessary and convenient.