The reason why it is better to avoid "rechargeable batteries" for disaster prevention storage

In general, batteries are consumables, but rechargeable batteries (secondary batteries) can be reused. Despite the trouble of charging, nickel hydrogen batteries can be used 2,000 times repeatedly, so it is economically and naturally good in the long run compared to the primary battery (alkaline / manganese battery) that is used up, and it is a battery -style digital. Ideal for gadgets. What should I do for the battery to be stocked for disaster prevention? However, it is conceivable to replace all batteries with secondary batteries. A typical example is a battery -type lighting fixture such as "flashlight" and "regular light", and this is more suitable for primary batteries. The reason is that it gets a little dark. Secondary batteries such as nickel hydrogen batteries, such as AA / AAA, have a lower voltage of 1.2V and primary batteries (1.5V), and are about 20%darker for lighting equipment using three batteries. It is calculation. In the case of gadgets where brightness is important like a flashlight, the brightness difference of 20%cannot be ignored, and primary batteries are more advantageous. Another reason is "natural discharge". Natural discharge is a phenomenon in which the amount of electricity stored in the battery decreases over time, and it is said that secondary batteries are larger. Nickel hydrogen batteries with reduced natural discharge are also sold, but primary batteries are more suitable for flashlight lights and disaster prevention radio equipment used in the event of an emergency disaster. In addition, a flashlight that uses an LED for the light source may not be the difference between primary and secondary batteries. In the case of a product equipped with a constant current drive circuit (LED driver), the luminance of the LED is maintained constantly because a constant current always flows. However, since the degree of consumption of the battery is difficult to understand, it is a good idea to choose a product equipped with an LED that informs you of a decrease in the battery voltage.

Maritime ninja