How to Store Nimh Batteries?

Nickel-metal hydride batteries(abbreviated Ni-MH batteries) are widely used in various electronic devices because of their high cost-effectiveness, reusability, safety and environmental protection. Understanding the basics of NiMH battery storage can optimize its storage environment, maintain battery performance, and extend service life. This not only saves money and resources, but also contributes to a cleaner environment.

Let’s learn about the storage methods of NiMH batteries!

Store Nimh Batteries

store nimh batteries

1. Inspection of NiMH Batteries Before Storage

If you purchase new, unopened NiMH batteries, do not remove them when storaging them. Because when merchants sell NiMH batteries, they usually have arranged the batteries neatly and isolated the positive and negative terminals, so it is best to keep them in their original packaging.

If the NiMH batteries are already in the device and will not be used for a long time, please remove the batteries for storage. Before storing, please wipe the battery surface with a soft, clean dry cloth to remove dust or dirt and keep the battery clean. This will help maintain the overall condition of the battery and prevent problems during storage.

Please store NiMH batteries separately according to old and new, manufacturer, production time, etc. Prevent them from reacting with each other to cause damage, leakage, etc.

If you find corrosion, leakage and other abnormalities in the battery, it is best to dispose of the battery properly and do not store it to avoid affecting other normal batteries.

2. Storage Containers for NiMH Batteries

First we need to exclude conductive containers such as metal, and we must be careful not to put coins or other metal substances together with the battery. Because metal contact with the battery may cause a short circuit or discharge.

Choose containers made of non-conductive materials. If possible, it is best to use this material to store each battery in isolation.

If multiple batteries need to be placed in the same container, please arrange them neatly to prevent the positive and negative terminals from contacting each other. It is best to cover the positive and negative terminals with plastic covers. And make sure the container is clean and free of any debris that could damage the battery. This helps reduce the risk of accidental discharge and potential damage from battery-to-battery contact.

Storage containers for NiMH batteries

3. Storage Locations for NiMH Batteries

Store NiMH batteries away from heat sources and flammable materials, as this may increase the risk of fire or explosion. They should also be protected from sunlight and UV rays and can be kept in a dark or cool place.

The storage location needs to be safe and stable. Do not place too many debris around it to avoid vibration, falling, and being squeezed by heavy objects.

If it is a home environment please place it out of the reach of children and pets to prevent mishandling or accidental swallowing, etc.

4. Storage Temperature and Humidity of NiMH Batteries

Storage temperatures that are too high, too low, or extreme fluctuations can negatively affect the electrical performance and service life of NiMH batteries. As a general rule, temperatures between 59°F (15°C) and 77°F (25°C) are preferred.

Humid environments are also very unfriendly to NiMH batteries. High humidity can cause battery corrosion and damage. The ideal humidity level is 35%-65%.

So, please do not store NiMH batteries in the refrigerator, both the temperature and humidity are very unfavorable.

check battery power

5. Ni-MH Battery Power during Storage

When storing NiMH batteries, check the battery power and avoid storing it with 0% power. Because NiMH batteries self-discharge, storing them at 0% capacity may cause excessive discharge and damage the battery. It is recommended to store them at about 80%.

Electricity can generally be measured with an instrument that detects electricity. If not, you can also use a multimeter to measure it. The voltage of NiMH batteries is generally below 1.2v before charging, and is normally around 1.4v after being fully charged. Use a multimeter to measure the voltage to determine the status of the battery.

In addition, when storing NiMH batteries, the batteries should be checked regularly (3 to 6 months recommended). Recharge batteries that are too low to maintain optimal performance and good condition.


Since each manufacturer produces slightly different batteries, we can read the manufacturer’s product specification or usage guide to store NiMH batteries.

These are the things to consider when storing NiMH batteries. Hope these storage tips can help you!

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