Whether it can be replaced, mainly depends on the power input problem of the electrical equipment, such as just a simple positive and negative two interfaces, there is no problem
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Use 3.7v instead of 7.4v protection board, need 2 3.7v protection board, the protection board can be connected in series, generally 3.7v protection board b; b-; p; p- (battery positive, battery negative, output positive, output negative) You can use according to these ports connected in series
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There is a problem in this series method, if one of the batteries has been fully charged to 4.2v, and the other battery has not been fully charged, this time because the protection board of the battery that has reached 4.2v will protect the battery and disconnect the circuit to prevent overcharging, so that the other battery can not continue to charge