Model battery selection

                   Model battery classification
There are many kinds of rechargeable batteries, but they are mainly used in the above models, such as large energy density, light weight and large discharge current. Low internal resistance of rechargeable batteries, when used to guard against short circuit, or may cause burns, fire.
Nickel cadmium battery (Ni-CD) is the main feature of excellent high current discharge performance, to meet the requirements of high power short time model. One of the most important performance indexes of the rechargeable battery is discharge rate. The so-called discharge rate refers to the ratio of the maximum continuous discharge current of the battery to its nominal capacity current (C). C represents a current with a small discharge or a nominal capacity of 1C. Usually a numeric representation is added before the capacity C. For example, some 1800 Ma battery discharge rate of 10 C, which means that the maximum continuous discharge power of 18A, visible discharge rate is an important indicator of the performance of the battery discharge. Due to the differences in the production process and structure, the discharge rate of different brands of batteries is often different. Domestic nickel battery is generally 6C~12C, imported batteries are usually a little higher, especially the model aircraft dedicated power batteries, often up to 20C or so, even more than 40 C high SANYO battery. The first choice is to choose a high battery battery.
  But the nickel cadmium battery energy density is small, and has the memory effect, the waste battery pollution to the environment is quite big, will soon be eliminated, at present only uses in the big current output the occasion. NiMH rechargeable battery (Ni-MH) is a kind of environmental protection, the use of performance and charging as well as nickel cadmium battery, the nominal voltage is 1.25 volts, but higher power density, has on many occasions to replace the nickel cadmium battery, only in the large current discharge performance aspect is not NiCd batteries in general 7C about. Nickel chromium batteries and nickel metal hydride batteries have the same series of models, commonly used mainly F type, D type, C type, SC type, A type, AA type (No. 5), AAA (7) type, etc.. Button, square, chewing gum, in addition to a number of special types of batteries, they are usually derived from the standard battery model specifications of the lengthened or shortened models. The battery monomer (battery core) is sometimes directly marked by the battery size, such as 18650, 1848, which is marked with a diameter of 18 mm, a length of 65 mm and a single cell of 8 mm. Models in the motor and the receiver are to use power supply, their voltage is generally more than 5 volts, the power group is generally more than 9~12 volts, which requires more than a series of batteries in general, with nickel spot welding connection. Amateur can use copper soldering, but attention should be paid to short welding time, avoid the battery damaged.
     Lithium ion polymer battery (Li-Poly) is the future development direction of rechargeable batteries. It has been widely used in handheld electronic products such as mobile phones. Lithium ion polymer monomer voltage up to 3.6 volts, energy density, light weight, no memory effect. But the lithium ion battery charging and discharging requirements are relatively high, it is difficult to achieve high current discharge, generally around 3C, otherwise it is easy to damage the battery. However, the discharge capacity of the lithium ion polymer battery for the model aircraft is up to 10C, and the safety of the lithium ion polymer battery is not a problem.
Package type lithium ion polymer battery is very large, mostly flat cuboid, and a protection circuit for each battery, the discharge voltage is lower than a certain time or the discharge current is higher than a certain time will be a lot of automatic protection, battery protection circuit with charging protection function. Lithium ion polymer battery using a plastic soft packing in the structure, a lithium ion battery from early liquid batteries (Li-ion) of the metal shell, in case of safety hazards, liquid explosive batteries, and polymer batteries will only tympania.
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