The rated voltage of the rechargeable battery is 1.2V, and the rated voltage of the ordinary battery is 1.5V.
The wall clock is designed according to 1.5V of ordinary battery when it is designed. When the voltage of the battery drops to about 1.2V, the wall clock stops due to insufficient voltage. But compared to the rechargeable battery, the power is sufficient when 1.2V, but the wall clock cannot run, so the wall clock is not suitable for using rechargeable batteries.
A rechargeable battery is a rechargeable battery with a limited number of recharges and is used in conjunction with a charger. Generally, No. 5 and No. 7 are sold in the market, but No. 1 is also available. The advantages of rechargeable batteries are economy, environmental protection, sufficient power, suitable for high-power, long-term electrical appliances (such as walkmans, electric toys, etc.). The voltage of the rechargeable battery is lower than that of the disposable battery of the same model, and the AA battery (rechargeable size 5) is 1.2 volts.