Nickel hydrogen batteries are a combination of hydrogen ions and metallic nickel, with a 30% higher battery capacity than nickel cadmium batteries. They are lighter, have a longer lifespan, and are environmentally friendly with no memory effect.

　　Volume: Rechargeable lithium-ion batteries are widely used in many new mobile devices due to their advantages over conventional nickel cadmium/nickel hydrogen batteries, such as small size (relative), light weight, low self discharge rate, and no memory effect. The batteries of mobile devices such as mobile phones, laptops, and PDAs that we usually use have gradually been replaced by lithium-ion batteries. The memory effect of nickel hydrogen batteries is not very clear. One thing is that when in urgent need, it is not necessary to discharge the light before charging. Usually, it is sufficient to discharge the light before use.

　　Battery capacity: Lithium ion batteries have a high specific energy and are compact in size; The voltage of a single lithium-ion battery is three times that of a nickel hydrogen battery; No memory effect, can be used and charged as needed. But it cannot be charged with just one use, as excessive charging and discharging can affect the battery's lifespan. Lithium ion batteries are not suitable for long-term storage as they may lose some capacity over time. After charging 40%, store it in the refrigerator's freezer.

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