Comparison Syma S107G vs WL Toys S929

The capacity of the battery supplied with the electric motor model (see "Motor"). Indicated only for variants using branded batteries (see "Battery type"), measured in ampere-hours: 1 Ah corresponds to the capacity at which the battery is capable of delivering a current of 1 A for 1 hour.

The higher the battery capacity, the more time the helicopter can spend in the air, usually. However, the practical time of operation on a charge is largely determined by other characteristics of the machine — dimensions and weight, engine model and power, etc. Therefore, in most cases, this parameter plays a purely reference role, and only helicopters that do not have any significant differences in other characteristics (and even then very approximately) can only be compared in terms of battery capacity.

The type of power source required to operate the helicopter. Note that such sources are required not only for models with electric motors (see "Engine") — any car needs electricity at least to power the radio signal receiver.

— AA. Replaceable cells of a standard size, popularly known as "finger-type batteries". In this standard size, not only rechargeable batteries are produced, but also disposable batteries, which makes it possible to choose: either to buy additional batteries every time as needed for relatively little money, or to pay a large amount for batteries once, but not to spend money in the future. Further expanding the choice is that AA elements have different characteristics and price, but are completely interchangeable. The main advantage over original batteries is the ability to quickly replace dead batteries: they are sold in almost all stores with “household trifles”, and the process itself usually takes less than a couple of minutes. On the other hand, the power of such a power supply is quite modest, and the elements themselves usually require several even to power on-board electronics. In some models, AA elements may be included in the package, but most often the owner of the car has to buy them on his own.

— Ni-Mh. This category includes batteries made using nickel-metal hydride technology and not related to any standard size — that is, having an original shape and characteristics and most often initially “sharpened” for a specific...helicopter model (or series of models). By themselves, the "original" batteries for the most part surpass AA cells in terms of characteristics and allow you to create models with electric motors of quite impressive power. Specifically, nickel-metal hydride batteries are notable for their low cost, reliability, good capacity, no "memory effect" (drop in capacity when charging an under-discharged cell), and resistance to temperature extremes, which makes them very useful for outdoor use. Among the disadvantages are storage requirements: such batteries cannot be stored completely discharged for more than a few days.

— Li-pol. Batteries of the original form, made using lithium-polymer technology. For the original form, see above (Ni-Mh). With regard to this technology, it allows you to create batteries with high capacity, small size and weight and without the "memory effect"; its main disadvantages in the case of radio-controlled models include sensitivity to low temperatures, as well as a rather high cost.

— Proprietary battery. This category includes all batteries of the original standard size (see subparagraph "Ni-Mh" above), for which the manufacturer did not specify the manufacturing technology. They may use one of the technologies described above, or another.

Operating time of an electric powered helicopter (see "Engine") on one battery charge or on one set of batteries. This parameter is rather conditional and approximate: it is usually indicated for optimal operating conditions, with a uniform low load on the engine (most often for hover mode), and when using replaceable cells — for high quality batteries. Accordingly, in fact, the operating time may differ markedly from that stated in the specifications. Nevertheless, this indicator quite reliably describes the battery life of the car, and different models can be compared according to it.

Capable of charging the helicopter battery from a standard USB port. This function is convenient primarily due to the prevalence of the USB standard: it is used in the vast majority of modern computers and laptops as a data transfer interface, and in portable electronics it is also used as a power source for charging batteries. Thus, a model with this feature can be connected for charging to computer equipment — or to any 220-to-USB network adapter. This is more convenient than using a specialized charger (which can also be lost). However the current power during such charging is relatively low, which is why it is poorly suited for powerful batteries.

General dimensions of the model. Note that the length and width are indicated only for the fuselage, excluding the main rotor. However, for ease of transportation, the blades are often made removable or folding.