No. 5 NiMH battery charging time, how many hours does it take for 4 cells of 1300 mAh

Friend, I have been engaged in nickel-metal hydride rechargeable batteries for photography for many years, I know this very well, according to the parameters you provided, I helped you calculate, your battery after the first use of photoelectricity, one-time four synchronous charging, it is best to charge 25-30 hours, that is, 5 to 10 hours more, not more than 30 hours, so as not to overcharge, damage to the battery, but your charger for your battery, belongs to slow charging, more hours, less hours, generally does not matter, do not worry too much。

In the following use, 18-20 hours of charging is sufficient. The calculation formula is 1300 100*, but it should be noted that all four sections should be charged at the same time. Because some chargers, if you don't charge four sections at the same time, the current will be increased by 2 or 4 times.

So it's best to charge four sections at the same time.

NiMH Battery Charging Time Calculator Edition post by:2004-4-3 16:10:54

Browse the details Fixed several bugs, added the knowledge of batteries and chargers.

Your charger parameter is 100mA per hour when you are 4 knots, and you need to rush at least 13 hours at 1300 for 4 knots. It's weird. 100mA chargers are now very rare, very few.

NiMH battery charging is divided into three ways: small current, standard current and large current, and the current (ma) = 1 3 of the battery capacity is the standard charging current, which is small current and large current. The maximum battery capacity cannot be exceeded.

The benefits of low-current charging: protect the battery, light overcharging does not have much effect on the battery;Disadvantages, long charging time;

Advantages of high current electricity: short charging time;Disadvantages: damage to the battery, affecting the service life.

First, check if your charger has a fast charging function and if the battery supports fast charging.

If not, in general, the charger has defaulted to the minimum output current to calculate the charging time, which is 60 mA.

The reason is that the output current of the charger is an interval value, and it can vary from 60 mA to 250 mA. If the maximum power is pressed then the battery may be overcharged during charging, which may cause the battery to be damaged or become unsafe. In addition, the charging time will be shortened due to overcharging.

Therefore, the charging time is generally calculated with a minimum output current of 60 mA. It can be calculated using the following formula:

Charge back blind charge time = battery capacity charger output current).

Among them, the battery capacity is 1400 mAh, and the charger output current is 60 mAh, which is to compensate for the loss of charging efficiency. According to this formula, the charging time is: slow stove.

Charging time = 1400 60) hours.

Therefore, charging with a 60 mA output current is about an hour.

The charger is charged at constant voltage, when the battery is empty, it is charged according to 250mA, and with the full charge, it slowly becomes 60mA, and finally becomes 0 mA, and the time is generally calculated according to the charging curve.

The median estimate is 125mA

The calculation of the charging time needs to be determined based on the capacity of the battery and the output current of the charger, rather than choosing 60 mA or 250 mA to calculate.

Normally, the higher the output current of the charger, the faster the charging speed. However, if excessive current is used to charge the battery, it may cause damage to the battery. Therefore, when choosing a charger, you should determine the right charger based on the maximum output power required by the device and the type of battery used.

In general, the charging time can be calculated by the following formula:

Charging time = battery capacity Charger output current.

For example, if a 2000 milliampere-hour (mAh) lithium-ion battery needs to be charged with a 1000 milliampere-hour (mAh) charger, the calculation formula is:

Charging time = 2000mAh 1000mA = 2 hours.

The method of calculating the charging time is as follows: first, calculate the capacity of the battery, and then divide it by the charger's early search current, and the result is the charging time. If the output current of the charger is in the range of 60-250 mA, then 60 mA can be selected as the benchmark for calculating the charging time.

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The national standard for the cycle life of nickel-metal hydride batteries is 500 times (80% DOD), and the company advertises 1000 times, which can be achieved by a single battery. NiMH rechargeable batteries can be used for more than 5 years. The memory effect of NiMH batteries is very small and negligible.

Theoretically, the life of nickel-metal hydride batteries is slightly longer than that of nickel-cadmium batteries, both of which are more than 5 years, but when nickel-metal hydride batteries are overcharged, the adverse effects on the battery are greater than those of nickel-cadmium batteries. The so-called correct charging is to make 100% of the capacity of the rechargeable battery play out without damaging the battery. Incorrect charging has two consequences, the capacity cannot be 100% exerted, and the battery is seriously damaged.

Although the memory effect of nickel-metal hydride batteries is small, it is still recommended that you try to recharge them after each use, and they are fully charged at one time, not charged for a while and then charged. This is an important point in prolonging life.

Generally, the number of cycles of nickel-metal hydride battery is 800 times and 1200 times;Batteries with low cycle times have high internal resistance and poor performance, so many cheap batteries generally have low cycle times. Therefore, to measure whether a battery is good or not, we cannot simply pursue how high the capacity is, but comprehensively consider the battery capacity and the number of cycles.

The life of this kind of battery is generally 300-500 times, if the quality is very good, it will be 500 times, if it is a general brand 300 times, it is almost the same. The energy density of a battery with this structure is compared to that of a lithium battery.

and the number of lifetimes.

NiMH Battery Charging Formula:

Charging time (hours) = (battery capacity mAh charging current mA) * (small current can be multiplied by ;The large current can be multiplied. NiMH batteries have no memory effect, and the battery can continue to be charged halfway through, which has little impact on the battery.

Remind you that some unknown manufacturers, false standard battery capacity, shoddy, if the actual battery capacity and its identified capacity is quite different, this formula time will be too long, will cause the battery to overcharge and hot or leakage. The recommendations are as follows:

1. It is recommended to buy GP, next-generation, Pinsheng and other well-known brand products; (The highest capacity of the next generation and Pinsheng is 2500mAh; GP maximum capacity 2400mAh).

2. If it is impossible to determine whether the battery capacity is false, it is recommended to purchase a smart light charger.

How much time can be fully charged depends on how big the charging current of your charger is, 250mA will be charged for 12 hours, 500mA will be charged for 6 hours, 1000mA will be charged for hours, and 2500mA will be charged for 1 hour

There is no fixed limit, depending on whether a small current or a large current is needed, nickel-metal hydride battery charging is divided into three ways: small current, standard current and high current, current (ma) = 1 3 of the battery capacity The value is the standard charging current, and the maximum can not exceed the battery capacity value.

1. The benefits of low-current charging: protect the battery, and light overcharging will not have much impact on the battery;

Disadvantages, long charging time;

Second, the benefits of high-current electricity: short charging time;

Disadvantages: damage to the battery, affecting the service life.

Charging time (hours) = (battery capacity mAh charging current mA) * (small current can be multiplied by ;The large current can be multiplied.

For example: 2100mAh battery, 700mAh is the standard charging current, less than 700mA is small current charging, greater than high current charging, charging current can not exceed 2100mA.

1. For nickel-cadmium batteries, as well as other rechargeable batteries (including batteries), the charging current is determined according to the capacity.

2. The unit of battery capacity is mAh, and the capacity divided by 10 is the ten-hour discharge rate, and the ten-hour discharge rate current constant current charging is [standard charging], and the charging time is 15 hours.

3. When charging, the charging current is larger than the standard charging current, which can shorten the charging time. Generally, it can be fully charged in 3 or 4 hours, and the charging current is: (take 3 hours as an example) battery capacity 3 conversion efficiency coefficient).

There is no fixed limit, it depends on whether you need to charge slowly or quickly, if you charge quickly, a battery of more than 2000 mAh can be charged with 800 mAh, and it is generally fully charged in 4-5 hours.

1000-2000 mAh battery, if you don't care about the time, it is recommended to use 100 mAh or less for slow charging, more sufficient, if you are in a hurry, you can use more than 400 mAh fast rush, 1000 mAh below the battery, it is recommended to charge slowly, such as 50 mAh, or 100 mAh for charging, if you use fast rushing, it may affect the use of the battery, reduce the service life (times).

Cough. Silly charge.

What is indicated on the battery is the charging time, that is to say, a 1000mAh battery, at a speed of 100mA, can be fully charged in a maximum of 16 hours, in fact, at a speed of 11-12 hours is about the same, and 16 hours is the maximum

And nickel-metal hydride can not only support charging, but also support, pulse even has 2C, so that the charging time will become shorter, your silly charge has two gears, fast charging 210ma, slow charging 100ma, the fastest more than 6 hours can be fully charged.

NiMH battery is a battery with poor charging acceptance, and simply increasing the current will not speed up the charging speed, so this kind of fixed current silly charge will not set the current very large, plus the silly charge will only charge hard, will not stop, and the current setting is too large to cause the battery to overheat after being filled, so the current setting of the silly charge is very small.

Silly charging is not very suitable for nickel-metal hydride, first of all, the charging efficiency is too low, the speed is slow, it is easy to heat, if the battery is not exhausted, or it is a fully charged battery at all, accidentally put it in again to charge for n hours.

Or use a smart charger, pulse charging, fast speed, and even 30 minutes of fast charging, according to the battery-δV, or temperature, etc., the domestic Huiyan, wise, Lion King, Yunli, are good, Sanyo's MR55,57,58, Sony's CS2A,2B

To give a formula for reference, it is not accurate to judge whether the battery is full by the charging time.

Battery capacity Charger output current Charger efficiency = approximate time.

Generally, the charger is set to switch to trickle charging after the battery reaches the detection full charge condition, and the charging current is only a few mA, which has no effect on the battery. Just use it with confidence, there will be no impact if the power is off halfway, and the charger will detect the battery status.

The standard voltage of each NiMH battery is the control voltage of charging, and the minimum discharge voltage is 1V.

The landlord's NiMH battery is 4 standard batteries connected in series, so the charging control voltage should be. The minimum discharge voltage is 4V.

The 9V solar battery charges this nickel-metal hydride battery pack, which cannot be charged directly, and needs to be connected to a full power failure control circuit, otherwise it will overcharge and damage the battery.

4 NiMH batteries have a maximum overcharge voltage, and the battery pack is rechargeable with 9V solar panels, and a resistor can be connected in series in the middle. Let the charging current be 400mA,;The resistor can be 10 ohms and 1 watt in series, so there will be no overcharge problem.

The maximum charge of the nickel-metal hydride battery is 2 times under the root number, and the lowest is a multiple.

The maximum overcharge voltage and the minimum overdischarge voltage.