Which is better, button battery or ordinary battery? What is the difference?

The button battery

Button (button cell) is also called the button cell batteries, is refers to the overall dimensions as a small button battery, generally larger diameter and thickness of thin (relative to the columnar cells such as market 5 AA batteries).Button batteries from shape up to the battery, battery of the same corresponding classification with columnar cells, square battery, special-shaped battery.

Common button batteries have a few kinds of such: according to the chemical composition of carbon, alkaline, zinc, silver oxide, zinc - air, lithium manganese dioxide, nickel cadmium rechargeable button battery, nickel metal hydride rechargeable button battery, etc. if the shape is the distinction between monomer and cascade. For detailed carbon button battery, the most common is the cheapest, alkaline are more expensive, but the discharge effect is good. Both voltage is 1.5 V, from alkaline AG1 to AG13, nominal capacity ranging from about 15 mAh to 140 mAh. Suitable for microamp level discharge requirements. Multi-purpose in calculators, electronic toys, hearing AIDS, lighters, watches and so on.

Zinc - silver oxide button battery, a button battery in the voltage 1.55 V, the capacity is higher than carbon, alkaline button batteries, high-order smooth discharge curve, about 90% of the part is always stable over 1.45 V, the discharge curve almost into a straight line, and then quickly off electricity, voltage vertical fall. The principal purpose is: the calculator, hearing AIDS, cameras, watches, etc. Special point out, this kind of battery leakage prevention effect is very good, and long-term use effect is good, I have been to customer change two pieces in the SLR cameras for metering system of power supply of domestic Dali AG13 batteries, it took more than eight years, to replace the new product, and no signs of leakage. Is really fierce!

Button battery besides can monomer batteries, due to its small volume, has also developed the high volt battery - more than the cascading button battery, common typical models are:

6 making (9 V) 4 (6 V), 15 f20 (22.5 V), 10 a (9 V), 11 a (6 V), 23 (12 V), a 25 (9 V), 26 a (6 V), 27 (12), a 476 a (6 V), 120 h7d (8.4 V), 2 x625a (3 V), and so on. After combination with button batteries, battery pack is very small, but the intensity of discharge is not big, multi-purpose in a small motor, small radio transmitting with dc power supply. It's important to note that because of the high voltage cascade combination multiple for ordinary carbon battery production, are generally not easy long stored, when buy should pay attention to the date of production, try to use the product produced in a year. Button batteries due to low cost, usually contain harmful substances, considerable damage to the environment, the battery need everyone's effective recycling more, do not arbitrarily discarded.

The difference between a button batteries and batteries

Because LED light-emitting diodes, starting voltage is generally above 2 V, section 7 battery only 1.5 V, need two to light up. And poor quality LED starting voltage is higher, some even higher than 3 v, which takes three batteries to a long time to light up the LED. Nonlinear due to the light emitting diode current curve, the voltage current would increase a lot, so direct driving with 4.5 V are not enough, can lead to burning or droop quickly. Need to add current-limiting resistance. This increases the complexity of the circuit and working procedure. Moreover, 7 have three need special battery, battery and battery shell size also increased a lot, it also increases the cost.

The button battery three (LED quality get by two lines) also can be piled up directly, do not need special battery, and button battery capacity, internal resistance is high, do not need to add the current limiting resistor. So from the cost of materials, process cost is taken into consideration, such as button battery is the optimal choice.

Use button battery of the torch, is the design for significant cost savings, and 7 battery of the torch itself is also belong to save cost and improve the usability design, is also more common on the market, such as a single section or three batteries can easily buy from the department store, and there's no need to charge maintenance, along with it change. Single section 7 battery actually also has a simple drive circuit design, only a few components is a booster circuit, the easiest is just a triple tube, an inductance can work with several resistance capacitance, low cost, slightly better is a little bit of a control IC add a resistance and several inductance capacitance. This flashlight is more common, but because of the cost limits of the drive circuit, the conversion efficiency is limited, and as a result of the limitation of cost usually don't use good LED, so the effect is limited.

Again a little bit high, some design you can only use 4.2 V for single section 10440The lithium battery1.5 V7 or can be compatible with ordinary batteries and battery with 7 size 4.2 V10440Lithium battery. The use of drive circuit is the size of the lifting pressure, relatively more expensive.

You can only use single section also has 5 batteries or ordinary 1.5 compatible V5 batteries or with the same size of 4.2 V single no.5 batteries 14500 battery of the flashlight.

Up again, is to use 4.2 V single section18650 lithium batteries laptop batteries commonly used batteries (before) the flashlight, this is one of the more popular the flashlight of the street. Use more convenient, some design recharge the flashlight body with socket, can put the charger plug in can go, but my impression of a few high-grade 18650 torch all don't take charge interface, need to take out the battery charging.

Up again, it is double 18650 or more bigger size flashlight lithium-ion batteries.

Another is the LED is also very important, a lot of cheap flashlight is used domestic LED, LED a luminous efficiency and light color problems, slant blue color of the light is bad, color looks cold white, due to the human eye is sensitive to blue and green light, the feeling is very bright, but according to the word of the road is a certain night, not very good to see the road. Better LED color is warm white, is the light yellow color, the look is not very bright, but the road will be easier to see. As for the problem, luminous efficiency is also simple, is also to input 1 w power leds, can send out to "light", term is lumens degrees or is luminous flux, this will no longer speak, popular speak be under the same power, high luminous efficiency and brighter. Import LED do this better than most of the domestic LED - at least for now I know the situation is so, such as Cree, OSRAM, philips and other LED.

Lithium battery also has safety, charger and maintenance problems.

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