when fully charged in just more than the actual value

NiMH batteries have memory effect, but no significant nickel-cadmium batteries. The most obvious is the memory effect of lithium batteries.
obvious memory effect means that you can charge many times, even without charging for each there will be too exhausted to fight on the impact. Therefore, when using NiMH batteries, generally not considered a direct discharge of charge.
, of course, to extend the service life from the point of view, the charging and discharging about 30-50 times, you can do a deep discharge, to return to maximum capacity.
discharge is not as simple as AUDIOPHONE said, then a small light bulb does not light up until you can. To do so often over-discharge, but damage the battery.
we all know, a NiMH battery rated at 1.2V, when fully charged in just more than the actual value, usually between 1.4-1.5V. With use, the voltage will gradually reduce, in general, the use of occasions, when the voltage is below 1V, the basic can not be used on, such as WALKMAN, CD DISKMAN, MD, MP3, DC, etc.. You can test your "power run out" of the battery voltage is.
but if the occasion is to use low voltage, small current will continue to discharge. We are talking generally refers to the depth of discharge voltage dropped to between 0.85V-0.9V. Through low-voltage, low current discharge, the time to reach this value, Ni-MH battery (also including nickel-cadmium) can be restored to maximum capacity, extended service life. But if it continues to discharge, if there is less than 0.8V may result in irreversible damage to the battery, but battery life is affected. This is why AUDIOPHONE approach is not recommended because, as you can not control voltage to automatically stop a certain value. Similarly, nickel cadmium batteries and nickel metal hydride batteries are not recommended for small remote control like electrical current.
depth of discharge of the battery better approach is to buy a charger or discharge functions specific discharger. The easiest way is to use AUDIOPHONE way, but be sure to always use the table read voltage, once the danger zone stop.
If it is in series, then simply multiplied by the battery voltage value above the number on it.
then look for long-term preservation and restoration without the battery method. Note that, because the nickel-cadmium batteries and nickel metal hydride batteries with different characteristics, so different preservation methods leaves. Nickel-cadmium battery is used to power to save, so we bought before the new nickel-cadmium battery is little electricity and need to re-own. In general, use the correct charging method takes about 3-5 times to charge up the battery back to its best. The nickel-metal hydride batteries to long-term preservation, it should charge to 80% (the people themselves should be considered), and then save. This is why now buy a new Ni-MH battery power came back somewhat because, as manufacturers have pre-charge, to prevent the transport cycle time too long, but battery is affected. Long-term preservation of the nickel-hydrogen battery, when I first used electricity, and then 2-3 times charge and discharge the right way can be restored to the best of. (After dinner, and continue to! Oh)
say that the issue on the charge. In fact, the most difficult to master is the correct charge.
charge from the charge current to points, a fast charge and slow charge the difference.
from the charging point of view, there is constant current charging and pulse charging the difference.
lot of people have this problem, whether it is a good fast charge or slow charge well.
that we first take a look at what is fast charge and what is slowly filling.
to a battery of nominal capacity of 1C, the 0.1-0.2C charge current for the slow charge, > 0.2C for fast charge, > 0.8C for ultra-fast charging, & ; lt; = 0.05C while a trickle charge. With a 1400MAH Ni-MH battery, for example, charge current between the 140MA-280MA for the slow charge, while the same 280MA charging current of a 700MAH battery is charging is fast. This shows that the fast charge or slow charge is a relative concept, and the capacity of the battery itself has great relevance.
go back to the previous question, what is good or slow speed good? ! In fact there's no fixed answer. Many people think that slow is good, that will hurt the battery fast charge. What will hurt the battery fast charge? The answer is yes, but not because many people think of "2010 christian louboutin-current battery charging damage." Large current is at best an accomplice, the real reason is fever, as fever caused by high current. christian louboutin patent pumps temperature greatly affect battery life. So 2010 christian louboutin current is not terrible, headache is how to solve the heat problem.
Here, it is necessary to introduce constant current charging and pulse charging concept. When filling in the slow, essentially all of the chargers are constant current charging method used, so that the circuit design simple, easy to implement. And because the charge current in the slow range, and will not cause the battery overheating. To the current charging with a quick question, and then use the constant current mode, no doubt the problem can not avoid battery overheating, so constant current method was abandoned. Instead, pulse mode can be seen from the waveform, the output charge current is not linear, but the sine wave. Peak, the current maximum, and then immediately into the trough, almost no current. This design is intended to allow the battery to have a recovery time, thus reducing the heat generated by high current, battery heat control at an acceptable level. Now on the market more than a hundred dollars or so to see the rapid charger, basically using this method. But also uses this type of charger voltage slope delta judge law judge law or to determine if the battery is full, once the full turn on the automatic trickle charge to avoid a large current over time damage the battery. More well-known example is the friends who recommended another fresh cow KN5060 charger. The Chargers are in the major electronic markets, which can be among the 65-70 win, is not very sophisticated work, the results are good, are highly cost-effective products.
to produce the rapid pulse charger is a good solution, but for some abnormal requirements, such as 1 hour fast charger, this time to use ultra-high-speed greater than 1C charge current for charging, pulse method, on insufficient. The current international law with the basic pulse is combined with additional depolarization way. In short, is based on the pulse method, when the upper half of a sine wave is completed, insert a short negative voltage of the cosine wave, to offset the excessive current enormous heat (polarization response) to the battery heat under control. This approach generally only in more specialized chargers, such as model aircraft used by the professional players use on the charger. Such chargers are often used 2C-3C can do the battery charging current.
said these methods, from the perspective of battery life, slow constant-current charge is undoubtedly the best way to ensure battery life. But time is money point of view, rapid charger, the time savings benefits, than the battery life of about 10% damage loss is much greater. This is why the fast charger is popular.
finally talk about the chewing gum battery. Many MP3 players on the MD player that you do not use the gum on the battery you, or how we were both playing time will be much worse.
this concept is wrong, chewing gum battery is only a form of battery, the essence remains the NiMH battery. In other words, a 1350MAH battery and a gum of 5 1350MAH Ni-MH battery playback is the same, no difference. In fact 5 NiMH batteries have emerged 1800MAH capacity, far more than chewing gum battery. Gum battery production, is to do as far as possible the thin Walkman devices, on the 5th battery specifications do not thin, but on the 7th Battery capacity has units of small, so small in Japan up this way, not because gum battery capacity is particularly great. And chewing gum batteries in nickel metal hydride and nickel are also differences between cadmium, nickel-cadmium early gum batteries but only 600MAH, not present on the 7th largest nickel metal hydride battery 750MAH