12v Battery Capacity
Capacity refers to the quantity of power held on within the battery. The unit of battery capability is “mAh”, and therefore the Chinese name is milliampere-hour (when mensuration large-capacity batteries like lead storage batteries, for convenience, it’s usually delineated by “Ah”, 1Ah=1000mAh).
If the rated capability of the battery is 1300mAh if the battery is discharged with a current of zero.1C (C is that the 12v battery capacity), that is, 130mA, the battery will work continuously for ten hours (1300mAh/130mA=10h); if the discharge current is 1300mA, then power supply the time is just regarding one hour (the actual operating time is somewhat different because of individual variations within the actual capability of the battery). This is an actual analysis in a perfect state. The current of a digital device in actual work cannot all the times be constant at a precise value (For example, a camera, the operating current are larger because of the gap or closing of the liquid crystal {display | LCD | digital display | alphanumeric display} display, flashlight, etc. Therefore, the battery will supply a probable value for the facility to provide a time of a precise device, and this value will only be calculable through the actual operation.
Type of the rechargeable batteries
Here we will introduce the categories of rechargeable batteries and the relevant terms. Now, AAA (commonly referred to as No. 7) and AA (commonly referred to as No. 5) normal batteries will with the wide usage of the foremost utilized in digital merchandise, and a few use special batteries. Despite their appearance, the batteries in it are divided into 3 types: Ni-Cd Battery, Ni-Mh Battery, and Li-on Battery.
Nickel-cadmium rechargeable battery
Nickel-cadmium rechargeable batteries can be charged at 1.7 times the voltage, typically three hundred to eight hundred times. The capacitance can decrease once five hundred times of charging and discharging, and might only reach 85%. The disadvantage of nickel-cadmium batteries is that in charging and discharging, needle-like crystals of cadmium can grow on the cathode, which typically penetrates the separator to cause internal nerve fiber short-circuits.
So what’s the “memory effect” of the battery? For nickel-cadmium batteries, since the negative polar of the battery is forged within the traditional method, the cadmium grains square measure comparatively coarse. If the nickel-cadmium batteries can be recharged before they’re fully discharged, the cadmium grains will probably be too straightforward to mixture and type once the battery is discharged. Discharge platform. The battery can store this discharge platform and use it because of the finish of discharge within the next cycle. Though the battery’s self capability will discharge the battery to a lower platform, the battery can only bear in mind this low capability within the ulterior discharge method. In other words, the 12v battery capacity becomes smaller, that is that the supposed “memory effect”.
Fig.2 what’s the “memory effect” of the battery?
Ni-MH rechargeable battery
The energy density of nickel-metal hydride batteries is larger than that of nickel-cadmium batteries, and therefore the capability of nickel-metal hydride batteries with identical volume will reach doubly that of nickel-cadmium batteries. At the identical time, it doesn’t contain harmful metals and is additional environmentally friendly. At an identical time, the Ni-MH battery primarily eliminates the “memory effect”. it’s a high charging potency and might charge 85% in two hours. However, it’s not immune to overcharge and over-discharge, that the charger of this type of battery should be ready to mechanically bring to a halt the facility, otherwise, it’ll simply cause harm to the battery.
Based on its benefits, nickel-metal hydride batteries have nearly fully replaced nickel-cadmium batteries. Now, most traditional AAA and AA batteries in the market will be nickel-hydrogen batteries. Once the capability of thought AA nickel-hydrogen batteries reaches 1500-2600mAH, the capability of thought AAA nickel-hydrogen batteries reaches 650-800mAH. Nickel-cadmium batteries with a capability of only several hundred mAH will seldom be seen, however, they’re not efficient as nickel-hydrogen batteries. It’s not suggested to decide on nickel-cadmium batteries for affordable costs. Concerning the selection of capability, the present LCD screens of electronic merchandise have gotten larger and bigger, and merchandise with big capability ought to be chosen the maximum amount as doable.
Lithium-Ion Battery
Our usually far-famed metallic element battery usually connects multiple cells in series, and therefore the voltage variation is between 3V and 4V (nominal voltage is 3.5V). There wont to be metal lithium-ion batteries, however, the lithium-ion battery is safer than the metal lithium natural philosophy. The rationale is that it uses the lithium-ion state. The lithium-ion battery has no flowable liquid solution however is modified to a compound solution to conduct electricity. As compare with nickel-hydrogen battery, lithium-ion battery will be 30% to 40% lighter and have a 60% higher capability. It’s no memory impact and has higher charge and discharge times.
Lithium-ion batteries usually don’t seem in normal AA, AAA forms, however are made in several forms consistent with the restrictions on the degree and shape of the battery by electrical appliances. The flexibility isn’t robust, and the battery is just appropriate for a precise or a precise complete Series of merchandise used. Because of the various sizes, the capability of lithium-ion batteries is additionally even additional different.
There is an easy method to check the battery capability: the voltage is usually identical once the batteries have stacked in series; the capacity is usually identical once the batteries have stacked in parallel, and therefore the voltage usually keeps the same.
The calculation technique of battery capability (C):
Capacity (C) = discharge battery (constant current) (I) × discharge time (hours) (T)
in turn:
Discharge time(T) = capability (C)/discharge current (constant current) (I)
Such as when a battery is discharged with a relentless current of 500MA (milliampere) for two hours, then the capability of the battery is capable 500MA*2H=1000MAH=1AH
For another example, when a battery is discharged for two hours with a current of five amps, then the capability of the battery is ten AH.
What is the voltage distinction between absolutely charged and discharged batteries? In reality, this depends on the kind and kind of batteries. If differing kinds of batteries will be different. As an example, the lithium-ion batteries for mobile phones have a rated voltage of 1.6 and a minimum voltage of 3V; A battery cell contains a rated voltage of 2V and a minimum voltage of 1.75V; if it’s 12V type batteries contains a rated voltage of 12V, with a minimum of 10.5V.
Conclusion:
The above is the method to quickly test the 12v battery capacity. If you are interested in rechargeable battery products, please check out more purchase advice from Maxworld Power which is an international and professional lithium battery manufacturer and trading company that provides excellent products basic knowledge and information to its audience and customers from home and abroad.
