What if Nickel-metal hydride batteries not use for a long time?

If it is not used, it will be discharged in a ratio of 0.2%-0.3% every day, and after a period of storage, even if it is not recycled, a small part of its capacity will be permanently lost, and its life will also be attenuated. Therefore, the battery should not be stored for more than 1 year.

First, nickel metal hydride batteries

1. In general, new NIMH batteries contain only a small amount of electricity, when you buy to recharged and then use. But if the battery factory time is shorter, electricity, recommend use before recharging.

2. New NIMH batteries typically after 3-4 times of charging and use, to play to the best performance, met many friends first charging small problems, for example, after the first charge on PP number did not imagine so much? After three to four time charge and use are solved.

3. Although the memory effect of Ni-MH battery is small, it is recommended that you try to recharge it after each use, and it is a one-time full. Do not charge it for a while and then recharge it. This is an important point of "longevity".

4. When the battery is being charged, pay attention to the heat around the charger, what fan blowing too sedulous no necessary, but note that the charger don't place too much stuff around. Ordinary users in the process of using battery, battery often do not have a dedicated storage bag; After the user in the replacement battery, tend to put the battery with good, and whether or not the place where a clean, damp. The consequence of this is battery stain easily, contact easy and metal? Such as key contact, easy to be affected with damp be affected with damp, which are the enemy of the battery. Suggestion: users should set up a battery special placement, and keep the battery clean. In order to avoid the problem such as power loss, keep the contact point at the ends of the battery and battery cover internal clean, when it is necessary to use soft, dry cloth gently wipe clean.

5. Long time no, remember to remove the batteries from the battery, put in dry environment recommended in the card battery box, can avoid the battery short circuit.

6. No nickel metal hydride batteries for a long time can deposit in a few months later, nature into a state of "dormancy" batteries, battery life is reduced greatly. If the NIMH batteries have been placed for a long time, it is advisable to suggest you use first slow charger to charge. Here involves another key issue: for nickel metal hydride batteries, battery should be completely discharge and then save, or charged to save? The two completely different points of view, should adopt what kind of? Many people think that the former should be adopted, but I think it is the battery charged preservation is quite reasonable. Because: according to the test, nickel metal hydride batteries charged about 80% is the best condition of preservation. This is because the NIMH battery self-discharge larger (10% - 15% a month), if the battery discharge completely before preservation, for a long time not to use, the battery self-discharge phenomenon will cause the battery over discharge, can damage the battery. Don't believe it? When you think about new buy is nickel metal hydride rechargeable batteries and electric, all of it is for this reason. Suggest: comparison, more correct point of view, and from the direction of the correct maintenance of the battery, otherwise it will backfire.

7. There are a lot of friends ask you post, how to discharge the NIMH? After asking many battery experts, a consistent conclusion to remind users: As far as possible not to NIMH battery discharge, discharge will cause the failure of charging, the harm is far greater than NIMH battery memory effect itself!

8. A multimeter self-checking batteries or not. Generally NIMH battery before charging, make sure voltage below 1.2 V, full of the normal voltage at around 1.4 V. You judge, also it is easy to judge the state of the battery.

9. Charger mainly divided into fast and slow filling. Slow charging flow is small, usually in about 200ma, such as our common charging current is around 160ma. It has a long charging time, and it takes about 16 hours to charge 1800mAh NiMH battery. Although time is slow, but the charge will be charge is enough, and does not hurt the battery. Fast charging circulation often are more than 400 ma, charging time significantly reduced a lot, 3-4 hours, you could just won everyone's favorite. Quick charge is a lot of more phyletic, the price is different. So people are often in doubt, with quick charge, why the price differs very big? Good charger especially good fast with the function of preventing overcharge protection, for our common Panasonic Acura charger BQ390 performed particularly well in this aspect, excellent chip software design on the battery, and the quick charge damage to the battery down to a minimum.

10. The contradiction appeared: slow charge but it does not hurt the battery charging time is too long; Quick charge can save time, but has damage to the battery, even if is the world's best Panasonic Acura charger BQ390 also can only be good to reduce the harm degree, but cannot avoid completely. Solution to the contradiction is to buy a quick charge and a slow filling. With fast was a period of time, after 5, 10, to switch to slow charge once or twice. And thus the performance of the battery back to his best.

11. When the battery is usually battery pack, is 4 and 6 together, at that time, keep the balance of each cell is very important, because otherwise one of the battery issue and affect the work of the whole battery pack. First of all, to ensure the same battery capacity, it is best to choose the same brand of the same model purchased at the same time. Then, to keep the agreement of the capacity of the battery inside, simply put, is the electric battery or is full, or empty. If there are more batteries to make several sets of battery packs, you can try "select". Specifically, battery cells with similar parameters such as capacity and voltage are connected in series to form a battery pack. Due to insufficient conditions, it is generally possible to measure the voltage after the discharge point and the voltage of the good power.

12. The last talk about charge and discharge.

High-grade NI MH of charging device is - DELTAV detect the battery voltage to judge whether the battery is full. Battery charging and discharging voltage curve is a little similar, is rising faster at the beginning, then slowly rising, wait for good times, voltage began falling fast, just drop in the magnitude of the is not very big. Before common nickel cadmium battery is similar, but the pace of decline and amplitude is larger than NI - MH. And the most chargers on the market (cheaper) often used is scale voltage charge, such as old GP charging treasure equilibrium voltage is 1.4 V, was rushed to the 1.4 V a battery because there is no voltage difference, the charging is over. As a result, often is not full of batteries, especially some old batteries, due to internal resistance increases, really add on the battery voltage is lower. Often small, and the charger current charging tend to be more than 10 hours. And use - DELTAV automatically cut off the charger, being able to accurately control the charging time, so you can compare the use of reliable large current charging.Large current charging for nickel metal hydride battery damage is not everybody imagination of interests, on the contrary, the use of DC now, need large current charging more.The first is a matter of time, don't speak. Ni-MH battery has a characteristic, then, that you charge the greater the current, it can release the greater the current, DC electricity eating tigers, now have no small current, so relatively use relatively large current charging is a wise choice, can let the battery put more clean. General charging current should not exceed 1.5 C, 5 C for battery capacity, is the 1000mah battery, not more than 1.5 A.I usually use 0.5 C to charge (my charger adjustable current).After discharge, under normal circumstances, the DC black screen to take charge and NI - MH memory effect is very small. But over a period of time after use, and to balance the cells, activate cells, to control the battery discharging termination voltage.NI MH battery - termination voltage of 0.9 V, discharge notice don't discharge, in each section 0.9 V battery can stop discharge.NI MH battery there are no nickel cadmium battery, over charge and heat are more sensitive. Charge and discharge the temperature. In general, don't let the battery temperature is higher than 45 degrees. When the battery is full, the battery will heat up. When the high current is full, the temperature should be about 42 degrees. Do not exceed 45 degrees. Otherwise, the life will be quickly reduced and the internal resistance of the battery will increase. Also, after charging, the battery temperature is high, and it can be charged after cooling, and the charging money should wait for the battery to cool. Re-use after a long time without using it. It is best to recharge the battery several times. When using it, pay attention to keeping the package intact and not damaged, so as to avoid short circuit. Don't hit the impact battery, don't burn it, etc.

Nickel-hydrogen batteries do not have a memory effect in theory. For the memory effect of setting a drop in capacity battery, we can through one-time enough disposable method of light again repeated several times, most of the battery can be fixed. Lay aside for some time long, lost the activity of cells can try to use the method of large current shock is trying to live.

For nickel metal hydride battery is the main characteristic of small internal resistance, large discharge current, hence many digital cameras are now using 1.2 V NIMH batteries, especially the digital camera 3 V power supply, when using two nickel metal hydride batteries only 2.4 V voltage, when powered up for the camera of the instantaneous current can reach more than 2 a, as if old NIMH battery internal resistance higher will cause the loss of voltage in an instant, the detection circuit of the camera will be mistaken for battery power is insufficient, will cause the battery is out of electricity cannot be completely used up or boot.

I have several groups of NIMH batteries have been used in the past two years time, now after a full charge only half boot, electricity, put it again after a week still can't open the machine would happen, but the battery can be normal use on other devices. After analysis that the old NIMH batteries after using for a long time, the internal electrode produce oxide make a battery internal resistance increases, so the NIMH batteries are no longer suitable for large starting current of the digital camera. How to reduce the internal resistance of old nickel-metal hydride batteries is the key to activating nickel-metal hydride batteries. Found in the use of the internal resistance has rise in nickel metal hydride batteries for high current discharge can be activated.

The specific method is: firstly charge the nickel-hydrogen battery, then connect the two nickel-metal hydride batteries in series, use a digital multimeter to adjust the current to 20A, and use the test leads to directly short the positive and negative terminals of the nickel-hydrogen battery. At this time, the shunt resistor and the test lead wire of the 20A current file in the digital multimeter become the load of the nickel-hydrogen battery. The resistance is very small, only a few tenths of a ohm, and the electric current indicating the meter will be stable from small to large at 4A, and the nickel-hydrogen battery will also be Slowly heating, when the temperature of the nickel-hydrogen battery is felt to be about 40 degrees, the discharge stops. When the temperature of the nickel-hydrogen battery returns to normal, it is discharged again, and the cycle is repeated until the voltage of each nickel-hydrogen battery drops to 1V, and the discharge process is completed. And then charge the NiMH battery normally. Generally, the nickel-hydrogen battery after one discharge process can be used normally. If it cannot be used normally, it will be re-discharged. If the nickel-hydrogen battery is not activated after three cycles of discharge, it should be thrown away. This method does not apply to new NiMH batteries and may shorten the life of NiMH batteries.

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