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How to Recondition NiMH Batteries in 3 Easy Steps

How to Recondition NiMH Batteries in 3 Easy Steps
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Batteries are one of the simplest but most invisible parts of our daily lives. Batteries, from remote areas of the TV to giant cars, are becoming the basis of every mechanical and electrical device. There are different types of batteries, each designed for different purposes. Some batteries last for months and years. But on the one hand, reviewers have something in common.

You can turn it on no matter how long the battery lasts. In other words, you can treat everyone carefully and prolong your life for months or years. Each battery is unique, so it has a unique upgrade process. This section applies to the replacement of NiMH batteries. NiMH stands for nickel-metal hydride batteries.

What are NiMH batteries?


Since the 1800s, Alessandro Volta invented the battery or voltage element based on the simple idea of ​​storing electricity in the form of chemical energy. Since then, batteries have been used as a major source of energy in various industries. NiMH batteries and NiCad batteries can be divided into one category.

They both promise longevity and work efficiently. The only difference between NiMH batteries is the presence of hydrogen as the active ingredient in the negative plate, which absorbs hydrogen (cathode) instead of cadmium. One of the last inventions of iconic founder Stanford Ovinhsky in 1986 was the invention of NIMH batteries.

The idea for a nickel-metal hydride battery was invented in 1970 when hydrogen was stored. Some compounds from metal hydrides and form thousands of times more hydrogen ions than them. Although the technology is currently highly developed, NiMH batteries are mainly used in high voltage cars. NiMH batteries have a higher energy concentration of 40% than lead-acid and nicotine.

If you look at the basic structure of a NiMH battery: it consists of two electrodes, a solution with a negative terminal or cathode absorbing hydrogen, and a positive polo terminal or anode nickel hydroxide. Both electrodes are immersed in an electrolyte called a potassium hydroxide (KOH). Potassium hydroxide is more harmful than nicotine and other chemicals used in lithium-ion batteries. Compared to NiCad batteries, NiMH is less likely to have “memory effects” when the batteries are discarded, and more likely to cause environmental damage.

Features of NiMH Batteries


  • In practice, the NiMH cell has several properties similar to the more popular NiCad. The current curve is similar to the NiCad, giving it an extra charge on the inside. However, it does not tolerate overload and experiences low power in this situation. This poses a serious problem for charger manufacturers.
  • Most smart Nicki chargers experience a small but important “rifle” when the NiCad is fully charged. In NiMH cells, this increase is very small, which complicates its detection. As a result, the temperature of the cells is also taken into account, because as soon as the cell is fully charged, most of the cell emits heat. Another problem is that the characteristics of NiMH cells vary considerably from manufacturer to manufacturer, and it is difficult to determine the charging capacity.
  • Interestingly, the charging efficiency of nickel-based batteries is about 100% and 70% of the total charge. This means that at first, the temperature is only slightly higher. As the charge level rises and the cell temperature rises, the efficiency decreases as heat is generated.


Why do NiMH batteries need to recondition?


NiMH batteries are the simplest rechargeable batteries on the market. Many companies have recognized the effectiveness of NiMH batteries, and companies such as Panasonic, Duracell, Energizer, and Rayovac offer AA and AAA NiMH batteries. With the many benefits of NiMH batteries, it is clear that lead acid is more valuable than batteries and NiCad batteries.

Buying a new NiMH battery in your pocket every time can be a little daunting. NiMH batteries are more efficient and prone to voltage fluctuations. Knowing how to charge NiMH batteries can save a lot. Testing a NiMH battery is very simple and anyone can do it. The proper operation does not require high technical skills.

How to Recondition NiMH batteries?


First, you will need some basic equipment such as a voltmeter, two spare cables, an alligator clamp, and a nickel-metal hydride battery regenerator. Connect the battery to the voltmeter to collect the readings. If the battery reads 1.0 volts or less, it will be fully charged. When the battery voltage is 1.2 volts, charge the battery only.

Three Easy Steps to Recondition NiMH Batteries

There are three steps here:

Step 1:

If the battery voltage is 1.2 volts, buy a quality battery regenerator and charge it for the next 6-8 hours so that the nickel-metal hydride battery can go through a full charge cycle.

Step 2:

When the battery is fully charged, let it dry completely. Now fill it up and put it in the airtight bag.

Step 3:

Put the airbag in the freezer for the next 2-3 hours. After freezing, allow the batteries to reach room temperature. The battery is now ready for use.

What if the voltage is less than 1 V when reconditioning NiMH batteries?


Nickel-hydride batteries have a “sleep” mechanism if the battery is long at the same time. You have to scare him. We need another power supply. You can use Picard batteries, spare cables, and crocodile clamps. Use alligators now to connect the NiCad battery to the empty NiMH battery – minus pole plus, minus pole.

When connecting the negative terminal, only touch the connector of the alligator clamp so that electrical impulses can pass through the discharged battery. Repeat the lesson 10-15 times. Use a voltmeter to check the voltage. After all, the voltage will rise to 1.2 volts. When the battery is normal, it can be charged for the next 6-8 hours for normal operation and maximum efficiency with the charger.


With the advent of lithium-ion batteries, nickel hydride batteries are rarely used. They do a great service to the volatile sector. NiMH batteries are based on the low production cost compared to other batteries and the excellent concept created for the eco-friendly product. NiMH batteries are easy to replace and have a long service life. Processing will increase fuel consumption by three to four times.

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