Watt-hour is a more accurate unit to show the power capacity than Amp-hour when compare batteries with different output voltages. Battery capacity and maximum output power are two different concepts. A Watt-hour battery may only output maximum Watt power.
Rated capacity and actual output capacity: A battery Watt-hour capacity usually is calculated based on battery cells nominal capacity. For example, if a battery cell capacity nominal capacity is 3. A battery cell capacity is rated under standardized test conditions and makes it possible to compare different battery cells.
However, the actual power output of a battery cell in real conditions is usually less than the nominal power output. Conditions are never as perfect as in a laboratory. Those extra circuits need to use some power from battery cells.
Lithium ion battery will self-discharge during storage. To prevent lithium ion battery to be over-discharged, lithium ion battery safety protection circuits will cut off battery output before the battery is actually fully discharged. A battery pack actual output power will be less than the battery rated capacity because of those factors.
Alternately, is the battery is discharged at a very slow rate using a low current, more energy can be extracted from the battery and the battery capacity is higher.
A common way of specifying battery capacity is to provide the battery capacity as a function of the time in which it takes to fully discharge the battery note that in practice the battery often cannot be fully discharged. The temperature of a battery will also affect the energy that can be extracted from it. At higher temperatures, the battery capacity is typically higher than at lower temperatures.
However, intentionally elevating battery temperature is not an effective method to increase battery capacity as this also decreases battery lifetime. The age and history of the battery have a major impact on the capacity of a battery.
Skip to main content. Leave this field blank. Rebelcell 24 volt batteries can be connected in series up to 48V without any problems. The technical specification for batteries often includes many other terms. Below we will try explain what the most important ones mean.
Voltage: this is the voltage that the battery delivers on average. As explained above, the battery starts with a higher voltage than when it is partially discharged. With this we mean the average of this progression or the nominal voltage. C1, C5, C this indicates battery capacity when discharged in a certain number of hours. Lead batteries have a lower capacity if they are discharged faster. That is why we always refer to our capacity as Capacity C1-C Read more about this in our article about effective battery capacity.
By this we mean that this battery can be compared to a lead battery with the indicated capacity when used in combination with an electric motor. 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.
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