(1) In general, new Ni-MH batteries contain only a small amount of power, so you should charge them before using them after purchase. However, if the battery has been shipped from the factory for a short period of time and has sufficient power, it is recommended to use it first and then charge it.

(2) Newly purchased Ni-MH batteries generally need to be charged and used 3-4 times before the performance is at its best. Many friends encounter minor problems with the first charge, such as the number of pictures taken after the first charge is not as much as they thought. After 3-4 times of charging and use, they will all be solved.

(3) Although the memory effect of Ni-MH battery is small, it is still recommended that you try to recharge it after each use, and to fill it up at once, not to use it for a while and then charge it again. This is an important point to “prolong life”.

(4) When charging the battery, pay attention to the heat dissipation around the charger, too deliberately with what fan blowing is not necessary, but we should pay attention to the charger around not to place too many debris. The average user often does not have a special storage bag for the battery; users will habitually put the battery away after replacing it, regardless of whether the place where it is placed is clean and damp. The consequence of this is that the batteries get dirty easily, the contacts are prone to contact with metal? The result is that the battery can get dirty, the contacts can easily come into contact with metal, such as keys, and it can easily get wet, all of which are the enemy of the battery. Advice: Users should set up a special place for the battery and keep it clean. To avoid problems such as power loss, keep the contacts at both ends of the battery and the inside of the battery cover clean, using a soft, clean dry cloth to wipe gently when necessary.

(5) When not in use for a long period of time, remember to remove the battery from the battery compartment and place it in a dry environment recommended into the branded battery compartment, which will prevent the battery from short circuiting.

(6) Ni-MH batteries that have not been used for a long time will naturally enter a “dormant” state after a few months of storage, and the battery life will be greatly reduced. If the Ni-MH battery has been stored for a long time, it is advisable to charge it with a slow charger first. This is because: according to tests, the best conditions for storing Ni-MH batteries are around 80% charged. This is because Ni-MH batteries have a large self-discharge (around 10%-15% a month). If the battery is completely discharged and then stored and not used for a long time, the self-discharge phenomenon of the battery will cause the battery to over-discharge and will damage it. Don’t believe me? Then think about whether all newly bought NiMH rechargeable batteries are still charged, of which this is the truth. Advice: compare, correct and start in the right direction to maintain your batteries, otherwise you will not get what you want.

(7) Discharge NiMH. Expert advice. Try not to discharge the Ni-MH battery, over-discharging will lead to charging failure, and the harm of doing so is far greater than the memory effect of the Ni-MH battery itself.

(8) Multimeter self-testing whether the battery is full or not. Generally, before charging Ni-MH battery, the voltage is below 1.2V, and the normal voltage is around 1.4V when it is full. We use this judgment, it is also easy to judge the state of the battery.

(9) Chargers are mainly divided into fast charging and slow charging. The slow charging current is small, usually around 200mA, for example, our common charging current is around 160mA. The charging time is long, it takes about 16 hours to charge an 1800mAh Ni-MH battery. Although the time is slower, the charge will be sufficient and will not damage the battery. The fast charging flow is usually above 400mA and the charging time is significantly reduced to 3-4 hours, which has won everyone’s favour. There are many different types of fast chargers with different prices. So people often wonder why there is such a big difference in price for the same fast charger. A good charger, especially a good fast charger, comes with anti-overcharging protection, for example, our common Panasonic Extreme charger BQ390 is particularly good in this regard, excellent chip software design capabilities in charging the battery, but also to minimize the damage of fast charging to the battery.

(10) The paradox arises that slow charging does not hurt the battery but takes too long to charge; fast charging saves time but hurts the battery, and even the best Panasonic Extreme Charger BQ390 in the world today can only reduce the degree of damage very well, but cannot be completely avoided. The solution to the paradox is to get a fast charger and a slow charger. After a period of charging with the fast charger, let’s say 5 to 10 times, switch to the slow charger for one or two charges. This restores the performance of the battery to its optimum state again.

(11) Batteries are generally used in packs, that is, 4 or 6 in series, when it is important to keep each battery in balance, otherwise the whole pack will be affected by a problem with one of the batteries. Firstly, it is important to ensure that the batteries are of the same capacity, and it is best to choose batteries of the same brand and the same model purchased at the same time. Then, it is important to maintain the same level of charge inside the battery, which simply means that the battery pack is either all full or all empty. If you have a large number of batteries in a group, try to “select” them. In other words, you can connect batteries of similar capacity, voltage and other parameters in series to form a battery pack.

(12) Finally, talk about charging and discharging. The high-grade NI-MH charger is used -DELTAV detects the battery voltage to determine whether the battery is full. The voltage curve when charging the battery is somewhat similar to that when discharging, starting with a relatively fast rise, then slowly rising, and when it is time to charge it, the voltage starts to fall again rapidly, only the fall is not very large. The previously used Ni-Cd batteries are similar, except that the rate and magnitude of the drop is greater than that of the NI-MH. The most common chargers on the market (the cheaper kind) often use constant voltage charging, for example, the old GP rechargeable is 1.4V constant voltage, that is, the battery is charged to 1.4V when there is no more voltage difference, the charging is over. The result of this is that the battery is often not fully charged, especially with some older batteries, and the voltage really added to the battery is even lower due to the increased internal resistance. Moreover, the current of such chargers is often low and charging often takes more than 10 hours. Chargers with -DELTAV automatic cut-off, on the other hand, can be used more reliably for high-current charging, as the charging time can be accurately controlled. High current charging is not as damaging to Ni-MH batteries as one might think. First of all, it is a matter of time, which goes without saying. The higher the current you charge, the higher the current it can discharge. Nowadays, DCs are all electric tigers and the current is not small, so it is a wise choice to charge at a relatively high current, so that the battery can be discharged more cleanly. I generally use 0.5C for charging (my charger has adjustable current). For discharging, in general, it is fine to take the DC to charge after it has gone black, the NI-MH memory effect is very small. However, after a period of use, and to balance the battery, to activate the battery, to control the battery discharge termination voltage, NI-MH battery termination voltage is 0.9V, when discharging, pay attention not to over discharge, to each battery 0.9V when you can stop discharging, NI-MH battery is not as strong as NiCd battery, to overcharge and over discharge and high temperature are more sensitive. Charge and discharge temperature. As a general rule, do not let the temperature of the battery go above 45 degrees. When the battery is full, the battery will be hot, the temperature should be about 42 degrees when filled with high current, do not exceed 45 degrees, otherwise the life will be reduced quickly and the internal resistance of the battery will increase. Also, the battery temperature is high after charging, wait for it to cool down before charging it, and wait for it to cool down before charging. If you do not use the battery again after a long period of time, it is best to recharge and reactivate the battery several times. Usually when using it, pay attention to keep the packaging skin intact, there should be no breakage to avoid short circuit. Do not drop and shock the battery, do not burn it, etc.