Energy is stored in cells within a battery. The battery has to be of a standard size to fit into the device but the capacity within that battery can differ. The term ‘battery size’ is often used, incorrectly, to describe battery capacity. The more energy storage potential a battery has the more charging it takes to maximize that potential. The other thing to remember about larger capacity batteries is that they can take longer to charge. Remember, the mAh is the measure of energy potential over time and not available power that can be delivered. If you’re replacing the battery and you have the option of a 2500, 3500 or 4000mAh battery that are fully compatible, bigger is always better. That assumes you’re not doing much with the phone.
In our example above, a 2500mAh battery can theoretically power a phone for up to 25 hours on low draw. As long as the battery is fully compatible, has been obtained from a reputable seller and is authorized by the device manufacturer, your only real decision is the mAh rating. With a current charge of 100 A during 1 h than with a current charge of 10 A during 10 h.If you have a cell phone or device with a removable battery and need to replace it, all other things being equal, the higher the mAh rating the longer time between charges.
Generally,įor a given capacity you will have less energy if you discharge in one hour than if you discharge in 20 hours, reversely you will store less energy in a battery Why is it important to know the C-rate or C-rating of a batteryĬ-rate is an important data for a battery because for most of batteries the energy stored or available depends on the speed of the charge or discharge current.
Last example, a lead acid battery with a C10 (or C/10) rated capacity of 3000 Ah should be charge or discharge in 10 hours withĪ current charge or discharge of 300 A. The Ah rating is normally marked on the battery.
#Lithium the power hour series#
That is why it is better to speak in Wh (Watt-hour) rather than Ah (ampere hour) when you speak of capacity of a pack of batteries with elements in series and parallel, because capacity in Watt-hour is not linked to the voltage of the system whereas capacity in Ampere-hour is linked to the voltage of the pack of batteries.Ĭ-rate is used to scale the charge and discharge current of a battery.įor a given capacity, C-rate is a measure that indicate at what current a battery is charged and discharged to reach its defined capacity.Ī 1C (or C/1) charge loads a battery that is rated at, say, 1000 Ah at 1000 A during one hour, so at the end of the hour the battery reach a capacity of 1000 Ah Ī 1C (or C/1) discharge drains the battery at that same rate.Ī 0.5C or (C/2) charge loads a battery that is rated at, say, 1000 Ah at 500 A so it takes two hours to charge the battery at the rating capacity of 1000 Ah Ī 2C charge loads a battery that is rated at, say, 1000 Ah at 2000 A, so it takes theoretically 30 minutes to charge the battery at the rating capacity of 1000 Ah Capacity in Ampere-hour of the system will be 2000 mAH (in a 1.5 V system). 2 batteries of 1000 mAh,1.5 V in parallel will have a global voltage of 1.5V and a current of 2000 mA if they are discharged in one hour. Capacity in Ampere-hour of the system will be 1000 mAh (in a 3 V system). 2 batteries of 1000 mAh,1.5 V in series will have a global voltage of 3V and a current of 1000 mA if they are discharged in one hour. The global capacity in Wh is the same for 2 batteries in serie or two batteries in parallel but when we speak in Ah or mAh it could be confusing. Ĭaution : do not confuse Ah and A, Ampere (A) is the unit for current, Ampere-hour (Ah) is a unit of energy or capacity, like Wh (Watt-hour) or kWh or joules.
To get the current in output of several batteries in parallel you have to sum the current of each branch. To get the voltage of batteries in series you have to sum the voltage of each cell in the serie. Configuration of batteries in series and in parallel : calculate global energy stored (capacity) according to voltage and AH value of each cell The capacity of a battery or accumulator is the amount of energy stored according to specific temperature, charge and discharge current value and time of charge or discharge.Įven if there is various technologies of batteries the principle of calculation of power, capacity, current and charge and disharge time (according to C-rate) is the same for any kind of battery like lithium, LiPo, Nimh or Lead accumulators. Principle and definitions Capacity and energy of a battery or storage system
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