The 3.7v lithium battery can replace 2 No. 5 batteries.
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The voltage of 2 No. 5 batteries in series is 3V, and the replacement of 3.7v lithium can not be said, but it can not perfectly replace the No. 5 battery, because the load is unchanged, the voltage reduction will lead to the reduction of power, but if the load input is 3v, the internal secondary voltage regulator to 3.3v to drive the circuit, then 3.7v lithium can be replaced.
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It depends on the load. Lithium battery charging precautions: The lithium battery is strictly prohibited from charging from the discharge terminal, and must be charged from the charging socket using the matching special charger. When the charging indicator on the charger stops rolling, remove the charging plug in time to avoid overcharging the battery.
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The lithium battery pack has the function of overcurrent protection. When the use current of the electrical equipment exceeds the maximum output current of the product, the overcurrent protection circuit will act and the electrical equipment will not seem to work normally.
Under normal circumstances, it is not possible to directly replace two 5 batteries with one 3.7 volt lithium battery. The standard voltage of the fifth battery is 1.5 volts, and the 3.7 volt lithium battery voltage is too high, which may cause damage to the microphone. In addition, the shape and size of the fifth battery and the lithium battery are also different, and can not be directly adapted. If you want to replace the use of lithium batteries, you need to convert and modify the circuit, and you also need to ensure that the converted voltage and current can meet the requirements of the microphone. To ensure safety and normal operation, you are advised to use the correct battery according to the original device requirements.