Why don't you use lithium batteries for recording pens?

The reasons why recording pens don't use lithium batteries can be mainly considered from three aspects: safety, service life and environmental protection:

From the safety point of view, the recording pen, as a portable recording device, has high frequency of use and simple operation. Although lithium-ion batteries have advantages in energy density and cycle life, their safety is relatively poor, especially in abnormal situations such as overcharge, overdischarge and short circuit, which are easy to burn or even explode. As daily necessities, the safety of recording pens is undoubtedly very important. In contrast, other types of batteries, such as Ni-MH and Ni-Cd batteries, are safer.

From the point of view of life, recording pens usually need to be used for a long time, and battery life is very important for user experience. After long-term use, the cycle life of lithium-ion battery will obviously decay, which will affect the performance of equipment. However, after long-term use, the performance of Ni-MH, Ni-Cd and other batteries decreases relatively slowly, which can better meet the needs of long-term use of recording pens.

From the point of view of environmental protection, lithium-ion batteries will produce certain environmental pollution in the production process, especially when dealing with waste batteries, the chemicals contained in them will cause potential harm to the environment. Although lithium batteries can be recycled, the recovery rate is relatively low. However, Ni-MH and Ni-Cd batteries have relatively little impact on the environment in the production process, and they can also be recycled after being discarded. Therefore, from the perspective of environmental protection, other types of batteries are more suitable for recording pens.

To sum up, the reason why recording pens don't use lithium batteries mainly lies in their safety, longevity and environmental protection considerations. Although lithium batteries have advantages in energy density and cycle life, their safety is poor, their life decays quickly, and they are potentially harmful to the environment, which makes other types of batteries more suitable for recording pens.