The 3.7V lithium battery can replace three No. 5 batteries.
The voltage of three No. 5 batteries in series is 4.5V, so it is impossible to replace the No. 5 battery with a 3.7V lithium battery, but it cannot perfectly replace the No. 5 battery, because when the load remains the same, the voltage reduction will lead to the reduction of power. However, if the load input is 4.5V, and the internal secondary voltage stabilization to 3.3V is used to drive the circuit, then a 3.7V lithium battery can be used to replace it. In short, it depends on the load.
Lithium battery charging precautions:
It is strictly forbidden to charge the lithium battery from the discharge terminal. It must be charged from the charging socket with a matching special charger. When the charging indicator bar on the charger stops rolling, please remove the charging plug in time to avoid overcharging the battery.
The lithium battery pack has an overcurrent protection function. When the use current of the electrical equipment exceeds the maximum output current of the product, the overcurrent protection circuit acts and makes the electrical equipment look unable to work normally.
