Battery Q&A Battery Q&A
質問

How do I read the symbols on batteries? How do I read the symbols on batteries?

答え

For example, LR means round alkaline battery, while CR means round lithium battery. The first letter denotes the type of battery, while the second denotes the shape (R meaning round).
If you know what these codes mean, you will understand the difference between batteries even if they look the same.

Battery codes

LR

Alkaline batteries
Alkaline button batteries

CR

Lithium batteries

SR

Silver-oxide batteries

質問

What does AA or D mean? What does AA or D mean?

答え

Until the 1940s, batteries were used as “packages”, with multiple batteries all used together.
Then, we started using batteries individually like we do today. Indeed, the “tan” character in Japanese battery sizes means “individual”.
The numbers that follow, and the letters used internationally, refer to the size of the battery.
The Japanese sizing system was formally introduced in 1942.

質問

Tell me which batteries can be used at temperatures below 0°C. Tell me which batteries can be used at temperatures below 0°C.

答え

Generally speaking, temperature drops make chemical reactions weaker, so the battery lifespan will fall by 50-90%. However, lithium batteries, nickel-metal hydride batteries, and Ni-Cd batteries are stronger in colder temperatures than manganese batteries, so are suited for cameras and other devices often used outdoors.

質問

2個以上組み合わせたときの注意は? 2個以上組み合わせたときの注意は?

答え

Do not mix batteries of different capacities, types, or brands. Also, do not mix dry and rechargeable batteries.
Finally, when using rechargeable batteries, ensure that all batteries were charged at the same time.

質問

What is the “memory effect”? (Rechargeable batteries) What is the “memory effect”? (Rechargeable batteries)

答え

If you repeatedly recharge Ni-Cd or nickel-metal hydride batteries before they run down, the batteries will “remember” that they are only used for short periods of time. The next time they are used, the voltage will drop immediately and they will be unable to power the device.

質問

What should I look out for when recharging batteries for the first time? What should I look out for when recharging batteries for the first time?

答え

When you use a battery for the first time, or a battery that has been unused for a long period, it may not be necessarily charged fully.
In this case, fully discharge and charge the battery 2-3 times.

質問

Is it a fault if my batteries get hot while charging? Is it a fault if my batteries get hot while charging?

答え

This is not a fault. It depends on the capacity of the rechargeable batteries and the charging conditions of the chargers, but both batteries and charger will generate heat.
For rapid charging of high-capacity rechargeable batteries in particular, the rechargeable battery surface can reach around 55°C, but this is not a problem. Even if the batteries become even hotter for whatever reason, there will be a protector circuit within the charger to prevent any damage to the batteries or any safety issues.
However, you must never cover the charger with anything that would block off ventilation during charging, such as a cloth or plastic sheet. Doing so may lead to severe overheating or malfunctioning protector circuits.
Also, you must never place the charger in direct contact with a heat source, such as a stove or radiator.

質問

When should I change the batteries in this product? When should I change the batteries in this product?

答え

Please refer to the symptoms in this chart. If the problem does not improve even when you insert new batteries, this may be a fault with the device and you should have it checked.

電池の取替え時期表

Portable stereo

Audio becomes distorted or quieter.

Electric shaver

Blade movement becomes weaker.

Flashlights

Light is not as bright as normal.

質問

Where is best to store my batteries? Where is best to store my batteries?

答え

When storing dry batteries for long periods, do so in a cool place away from humidity.

質問

Will my batteries last longer if I store them in the refrigerator? Will my batteries last longer if I store them in the refrigerator?

答え

It is always best to store batteries at low temperature and humidity. However, storing in refrigerators should be avoided as condensation on the battery when removed from the refrigerator may cause it to self-discharge and/or rust.

質問

What is Battery Day? What is Battery Day?

答え

In Japan, November 11 is Battery Day. “Eleven” is written 十一 in Japanese, so looks like the plus and minus on a battery. This day was established in 1986.

質問

What is Battery Month? What is Battery Month?

答え

The month from November 11 (Battery Day) to December 12 (Car Battery Day) is known as Battery Month.
Take these opportunities to check the batteries in your home, and to make sure you use them wisely and safely.