A Wh battery has more capacity than Wh battery for sure. This is a very misleading unit. When a battery is rated with mAh or Ah, it should always associated with a voltage. A 10Ah 12V battery capacity is bigger than a 10Ah 5V battery. However, there are a lot lot of lithium batteries on market that do not state voltage when claim their mAh or Ah capacity.
In these cases, most likely they measure with lithium battery cell voltage, which is 3. By time 3. For example, a 10,mAh battery actual capacity is x 3. You can compare two battery capacities by Amp-hour only if they have same voltages. If two batteries have different voltages, using Watt-hour will be more accurate.
We recommend to compare battery capacities by Watt-hour, not Amp-hour. Watt-hour is a more accurate unit to show the power capacity than Amp-hour when compare batteries with different output voltages.
It is the unit of a battery capacity that measures the amount of charge that can be available in a fully charged battery. This amount of charge is what determines the amount of current that can be discharged from the battery and its discharge time. This is why it is also called a charge or coulometric capacity. Note: The coulometric is derived from the unit of charge, Coulombs. Where Q is the amount of charge, I is the Discharge current in Ampere and t is the discharge time in hours.
For example, a Ah battery means that a current of A can be discharged through the battery for 2 hours. Another example: mAh battery means that theoretically, a current of mA can flow the battery for 10 hours. The SI unit of Q is Coulombs. The discharge current and time from the above example is for ideal batteries. They can vary based on certain conditions. The Ampere-hour can be seen in both high and low capacity batteries.
However, in low capacity batteries, it comes as a mAh. Key points: Ampere hour is the unit of a battery capacity that determines how much charge can be available in a fully charged battery. In turn, the available charge determines how much current can be discharged and its discharge time. It has just one difference with Ah. Milli means 0. It is a unit prefix that represents thousandths. So, when you see mAh, it actually means thousandths of Ah.
For example, a mAh means a thousandth of Ah. So, mAh is the same as 3Ah. So, to convert mAh to Ah , you multiply the mAh by 0. Most of your rechargeable devices have their battery rated in mAh.
Even your power bank. Often a lithium battery with a much lower Ah can in practice deliver the same amount as a lead-acid battery with a much higher Ah.
In practice, for example, the Rebelcell 12V50 can be compared to a Ah semi-traction battery in terms of operating time for an electric motor. This also has everything to do with the usable battery capacity. Nominal energy: this is the battery capacity measured in watt-hours see above for explanation.
Maximum continuous discharge: this is the maximum number of amps the battery can continuously deliver. Suppose a battery has a maximum continuous discharge of 30A, then you cannot connect a device that draws more than 30A. The higher the capacity of the battery, the higher the maximum continuous discharge.
Peak discharge 10 milli-sec : this is the maximum number of amps the battery can deliver for 10 milli-seconds. This is always higher than the maximum continuous discharge. This is for example the case when you go from zero to full throttle in one go with an electric outboard engine. At that moment, the motor requires more amps than the rated maximum for a short time. Energy density: with this we measure the number of Watt-hours per kilo of battery.
Energy density is much higher for lithium batteries than for lead-acid batteries. A high energy density means that you can store more energy in the same space. And this results in a lighter and smaller battery. Bandwidth voltage: see explanation of the discharge and capacity of batteries.
Charge temperature: this gives the minimum and maximum temperature at which a battery can be charged. Discharge temperature: this indicates the minimum and maximum temperature at which a battery can be discharged. Storage temperature: This indicates the minimum and maximum temperature at which a battery can be stored safely.
Maximum charge current: This gives the maximum current in A at which the battery can be charged. The higher this number, the faster the battery can be charged with the right battery charger.
Integrated cell balancing: part of the Battery Management System. This is necessary for optimal use and performance of the battery. Temperature protection: part of the Battery Management System. The battery is switched off when the temperature becomes too high or too low. This is a protection to prevent damage. Maximum discharge current protection: part of the Battery Management System.
The battery is switched off when the power draw of your equipment is higher than is allowed. Overvoltage protection: part of the Battery Management System. The battery is switched off when the voltage becomes too high and the battery is overcharged.
Volt, Amps, Amp-hour, Watt and Watt-hour: terminology and guide. Volt or Voltage V : The number of volts is the amount of energy given to an electronic circuit.
0コメント