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In some hand-held electronic products with 3.6V/7.2V lithium-ion batteries, this paper designs a charger for 3.6V/7.2V lithium-ion batteries. The main features of the charger are as follows: firstly, under the control of 8051F330, the charger has automatic identification of battery specifications of charging ports, automatic completion of charging, real-time monitoring of charging status and charging status indicated by charging indicator lamp. Secondly, the charger has the function of fault alarm and fault protection. When the battery fails, it will flash the alarm with the indicator lamp. Finally, the charger has the advantages of simple operation, stable operation, intelligent and reliable.