Before settling for any of the best drones under $100, ensure that the spare parts are easily accessible. You will definitely require an extra pair of propellers, other than the inbuilt pair, as well as essential tools to fix the spare when the inbuilt gets bad. You will also need sufficient protectors for your quadcopter – they come handy in protecting your drone from getting damaged, damaging properties, or injuring people during clumsy flights and landings. An extra pair of batteries is also a good buy, especially in instances where the drone is expected to serve longer than usual. The batteries of most drones under $100 are usually sold in six-pack sets, alongside a charger. With this set, you can get an average flight time of 5-10 minutes before recharging them or switching them with charged ones. It is important to note that the battery time depends on the blade protectors and the presence or absence of a camera.  
For example, OPTI has a built-in Optiflow Sensor (a downward facing sensor), which functions by picking out the patterns on the ground to ensure that the drone maintains a straight position.  ATTI, conversely, works a bit differently. With the ATTI, the drone employs other techniques apart from the external sensors to keep the drone in the right orientation and altitude. Thus, the drone can hover in place, or drift slightly around with the wind serving as a push. You will also find a GPS in some drones, and they help the drone to maintain coordinated and precise flights and landings.

The flying range is the distance the drone can go before you start to lose control of it. You’re not going to see a tremendous flying range with drones at this price, but there can still be considerable differences among models. These drones are generally able to fly from 15 meters to 100 meters or so. Buy a drone with the longest range you can afford to give yourself more flying and photo/video options.
If a drone in this category has first-person-view (FPV) capability, you can see what the drone sees. All except one of these drones require a smartphone (not included) to be able to view and record the video. The smartphone is held in a bracket and then it is connected to the controller. Some of these drones can be flown by only using the smartphone with a downloadable app installed that controls the drone. 
Naturally, there are a couple of downsides to a drone being this small – it’s not particularly happy when flying in breezy conditions and the battery life is barely longer than ten minutes. Still, while the body is made of plastic, it’s tough enough so survive some crashes and, in the right conditions, the Tello is an impressively stable and responsive flyer.
While most drones over 50 have the capacity to turn, which is also known as yawing, also check that your machine can bank sideways and has the third axis of flight that allows it to go upwards and downwards. Such a drone will allow you to learn the basics of flight with ease, which include the yaw, bank and pitching that involves forward and backward movement.
After we’ve taken the drone out to play for a while and jotted down a few notes about how long the battery lasts, we put it on the charger and grab a stopwatch to determine recharge time. Then we take it back out and do a hover test. By flying the drone in the least demanding conditions, we can get a sense of what the maximum flight time is. And finally, we take it out a few more good, hard flights to find out how long the battery lasts (on average) under normal conditions.
This drone is a good option for those looking to upgrade from a toy drone to something more like a professional racing drone. It comes with headless mode and flip mode. Plus, the remote is clearly labeled so even if you’ve never picked up a drone remote before, you know exactly what’s going on. It has a range of about 230 feet, plenty of space for a more serious race. It’s well balanced and can handle a little bit of wind.
One of the most useful features of this drone that makes it great for beginners is how stable it remains while in the air. It even has a no-tip function to allow for an even smoother fly. This is the best small drone for less than $100, for the beginner looking to experiment with a fast, versatile, and extremely smooth flying drone at a shockingly affordable price. It comes with a 2.4ghz transmitter, spare propellers, and a USB charging cable, charges in forty minutes, and offers a decent amount of flight time averaging out at nine minutes. 

Most still cameras are 5 megapixels or higher. Therefore, do not be fooled by the claims of HD for a camera when the manufacturer is relying on the resolution for still photos. It is true what they are saying but not the complete story. Having HD resolution for still images does not explain the possibility of also having a lower quality for video-image capture. 
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