If it is about the same size as an AA battery, you can choose a 10440 lithium battery to replace it directly. If it is about the same size as an AA battery, you can use a 14500 lithium battery to directly replace it. thicker and longer than AA batteries, you can choose 18650 lithium batteries. These batteries are all 3.7V. The same size batteries have higher capacities than nickel cadmium batteries. The key is to buy a special charger. in electronic cities. If you can't buy it, you can buy it directly on Taobao. Enter the battery model on Taobao and you can search it directly.
You can search the specifications of these batteries on the. Internet yourself. If you think the size is similar, you can replace it directly. Remember to buy a charger when purchasing.
According to your description, the same battery you haveYou need may no longer be produced, but similar products. should always be available. According to the battery specifications and sizes, it should be a 26700 battery (that is, the battery diameter is 26mm and the battery length is 70mm. 26700 batteries sold on Taobao are all 4.2 V). find out if the product you are using can handle the voltage of 4.2 V. Of course, this is also possible if the voltage level is increased. It can work normally by changing the circuit. There is a Bic 26700 3.7V home battery. The key is that there is no online purchasing method. However, you can search the web and see ****, but not sure how the battery will work. No retail sales
.