Rechargeable NiMH Batteries

In today’s world where everyone is trying to go green, the rechargeable NiMH batteries are considered to be highly environmentally friendly. In fact, it will be a good idea to replace all of your battery needs with rechargeable NiMH batteries. However, the biggest question here is what are NiMH batteries?

What are NiMH Batteries?
NiMH, which stands for “nickel metal hydride”, are those rechargeable batteries that do not suffer from the memory effect, unlike that of nickel cadmium or NiCd batteries. Nickel cadmium batteries have a big drawback in that they have to be completely discharged before actually recharging them or else they will suffer from a drop in voltage the minute they are put in for recharging. The NiCd batteries are very smart and they remember the exact point from where the battery started recharging. It would start causing problems exactly at that particular point. This is referred to as memory effect as the memory of NiCd battery is very sharp.

Besides this, it cannot be overlooked that the NiCd batteries undoubtedly contain cadmium as one of the metals, which is certainly a very dangerous and toxic heavy metal. This metal is capable of causing severe air, water and land pollution if it is buried or incinerated, thereby releasing toxic gases. Therefore, it is advisable to always recycle the NiCd batteries.

Charging Capacities of NiMH Batteries
Depending on the type of the battery, NiMH batteries can have varied charge capacities. To consider, for example, the AA NiMH battery can have a charge capacity ranging from 1100 – 2800 milliampere hour. Similarly, AAA can easily range from 850-1000mAh. The higher the value of mAh, the longer will be the life of the battery between two charges.

You can now extend the life of the NiMH battery by simply recharging the batteries frequently and not letting them drain out completely. Depending upon the use and the discharge limit before recharging, the batteries can be easily recharged somewhere between 500-1000 times.

As we all know that nothing can be perfect in this world, therefore, the NiMH battery also comes with a disadvantage. These batteries discharge at quite a significant rate, which is around 5-10%, the very first day and then gradually leveling off somewhere between 0.5-1% every day at the room temperature. These batteries are just perfect for CD players, PDAs, toys, portable games, MP3 players and last but not the least, digital cameras. The main reason being that all of the above mentioned are high drain devices, which will have to be recharged quite frequently. You should certainly avoid the use of these batteries especially in the low drain devices such as remote controls, smoke detectors and clocks.

Although, the alkaline batteries might appear to be quite cheap at the very first glance, but you can only use these batteries once and then you have to throw them away once they have discharged. In fact, these alkaline batteries come up to be quite expensive, if you add up all the cost that you have incurred in buying these alkaline batteries every time they are discharged.

NiMH batteries – The Need of the Hour
NiMH batteries should be used in almost all the applications at your home or outside, mainly because of the lack of the memory effect, less harmful compounds especially for the environment and most of all its ability to be recharged hundreds of times. Due to these reasons, NiMH batteries are certainly considered to be the money-savers and can also help in protecting the environment by producing less trash to end up in the overflowing landfills.

This Rechargeable NiMH Batteries Review is Written/Updated on Oct 14th, 2009 and filed under Consumer Electronics. Both comments and pings are currently closed.

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