Firstly, let's introduce an important parameter of rechargeable batteries - battery capacity, expressed in units of AH (ampere hours). We can see that it is a composite unit composed of the product of current units and time units, representing the product of the continuous discharge time of the battery at a constant current. In small batteries, we usually use smaller units of mAH (milliampere hour) to represent it. For example, an ideal fully charged battery can last for 10 hours with a 60MA current discharge. Multiplying the discharge current by time shows that the capacity of this battery is 600mAH. In theory, if it is used for a 600MA discharge, it can be used for one hour (dividing the discharge current by the battery capacity). The battery capacity parameter represents the amount of battery capacity that can be stored, and under the same volume, more is always better. Generally, we can see the capacity label on the retail packaging of the battery.

　　The main considerations for purchasing such rechargeable batteries are capacity, specifications, and price. Firstly, determine the specifications for purchasing batteries. For devices with relatively small battery compartments or devices that require multiple batteries to be placed side by side, it is important to pay attention to whether it is appropriate to purchase high capacity and thick diameter batteries. There are also two different forms of positive electrodes for rechargeable batteries. One is similar to regular batteries, which have some protrusions to help make good contact with the battery box or other negative electrodes. The other is a flat battery cap, which is more suitable for welding into battery blocks. It is recommended to generally use the former form of rechargeable battery. The rechargeable batteries on the packaging are divided into industrial packaging and retail packaging. Industrial packaging only uses monochrome plastic skin, mainly supplied by manufacturers for battery blocks. There is no other information on a single battery except for the production date. The appearance of retail packaging is relatively beautiful, with detailed information including brand, trademark, capacity, and origin. Some also come with simple charging methods, suitable for ordinary users. Next is the selection of battery capacity. For devices with high power consumption such as digital cameras, flash lights, communication equipment, etc., considering working time and performance, high capacity nickel hydrogen batteries are the preferred choice. High capacity batteries can be used for a longer period of time after being fully used at once. The 5th battery can reach 1200-1300mAH, and the 7th battery can reach 550mAH, almost twice the capacity of low capacity nickel cadmium batteries. For low-power radios, choosing nickel cadmium batteries is more cost-effective. Once again, it is the choice of the brand. Generally, branded products have guaranteed quality and excellent performance, and many mobile phones and walkie talkies use batteries from Panasonic, Sanyo, and Toshiba. The GP supercar is well-known among retail nickel hydrogen batteries, and there is also a combination packaging that provides chargers. The domestically produced Swan brand is also good. GP, Hitachi, and Panasonic are more common in nickel cadmium batteries, and their performance is also relatively good.

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