### What´s Mean 2S 3S 1C Of Model Aircraft Battery?

Model aircraft is now mainly used lithium and NiMH. There are two types of lithium batteries: lithium-ion and lithium polymer, now mostly used lithium-polymer. In the case of the same capacity and discharge, NiMH weight than lithium. It is recommended to choose lithium battery!

Speaking of batteries, would often listen to others speaking 2S, 3S, What does that mean? Simply say, 2S refers to two cells in series battery pack, 3S refers to three cells in series battery pack, what are the benefits of in series? It is to increase the voltage, voltage and motor speed are related.

For lithium battery, 2S there is voltage of 7.4V, 3S there is voltage of 11.1 volts. Because a lithium voltage is 3.7V, and a NiMH battery is only 1.2 volts, 2.4 volts so 2S, 10S was only 12 volts.
Please note that whether it is 3.7V lithium battery or 1.2V NiMH batteries, does not mean voltage when the battery is fully charged. For lithium battery, the fully charged voltage is generally reaches 4.2V, I believe most people have the hands of mobile phone batteries Universal Charger, you can see, the general indicated above output voltages are 4.2V. And NiMH after full charge can reach about 1.5V.

In addition to voltage, then that is the capacity and discharge rate. Battery capacity to mah (mAh) as a unit, the discharge rate by C units. In short 1C for different capacity battery is not the same. 1C refers to the battery in 1C discharging can continue to work with one hour.
Example: 1500mah capacity battery continue to work one hour, then the average current is 1500ma, that is 1.5A, 1.5A that is is the battery 1C. If the above nominal 10C. Then the battery maximum discharge current is 1.5A * 10 = 15A. That is under the battery 15A is safe to use.

Another example,  1C in 1000mah capacity is 1000ma, is 1A. If the above nominal 15C. Then the maximum discharge current is 1A * 15 = 15A, the battery maximum discharge current is 15A. But the above battery is working to 15A, 10C discharge, In theory, the maximum current work using 60/10 = 6 minutes. And 1000mah work to 15A, 15C discharge, Theoretical work with this current can be used 60/15 = 4 minutes. So relatively speaking, 1500mah, 10C of the battery to be used for a longer time. So when buying batteries just consider C number is not enough. discharge battery with small C number may be more discharge than battery with C number larger. This related to the capacity.

### How To Extend Hubsan X4 H501S Remote Control Distance?

Hubsan X4 501S is a cost-effective small drone quadcopter, but image transmission distance just about 300 meters, if you want extend the transmission distance, it's easy, even no necessary change the antenna, just follow these 3 steps:
1. As shown below image, original antenna head is inward direction, put this antenna to get down, let it outward, and as far as possible by remote control edge

2. Like following image, 5.8g receiver original is mounted to the inside, to make it as close to the front, near the remote edges, and pouring sealant.

3. As shown below: separated in the middle with aluminum foil, then gumming, remember higher a little, the back cover just to suppress.

Thus, modification is completed, should be noted that, 2.4G inclined 45 degrees to install, 5.8g flat antenna, please try to tilt outward or parallel with the housing, this can be slightly adjusted by the test.
Upon completion, re-frequency remote control and aircraft: Press the camera button, open the remo…

### Zerotech Hunter Leaked, Looks Like DJI Mavic

Some photos of Zerotech new product, the Hunter, have been leaked, come with folding arm design, very compact size, it is slightly smaller than DJI's first folding drone MAVIC. The battery compartment occupies a large part of the body space, it speculated that duration should be relatively dobby's seven minutes have greatly improved.

With an insider revealed the aircraft life time up to 15 minutes +, and the image transmission distance of up to 1.5KM +

But unfortunately, there is no positive picture of the aircraft, whether equipped with mechanical three-axis gimbal is not known. In order to save costs, still use electronic stability is also possible. This mini folding muotirotor will be a strong competitor to DJI MAVIC,  please stay tuned.

### Zerotech Dobby Usage Guidelines: How To Download Dobby APP & Charging The Battery

Zerotech Dobby Pocket Selfie Drone now available for sale @ geekbuying.com , but cause currently the manual is only in Chinese, so in order to let everyone more convenient to use DOBBY pocket drones, I will be launched Zerotech Dobby English Usage Guidelines in here, hope it's helpful for Zerotech Dobby Fans. Today let's talk about how to download app and charging the battery.
Do.Fun  APP
Do.Fun is ZEROTECH launched a UAV flight control software, DOBBY pocket drone flight control etc. need to control through the APP.