How to safety discharge batteries

The batteries make our life more convenient, as the electric power, we should use them safety. Last week, we talk about how to charge lipo battery, from the article you have learned charge lipo battery is not easy thing, we should take more carefully. Today, we will give you some advises about how to discharge batteries.

1. Don't discharge Batteries at amperage rates higher than specified on Batteries' labels.

2. Don't allow the temperature of Batteries to exceed 140°F during discharge. Adequate cooling for Batteries is required, especially when discharging at or near maximum rates.

3. Don't discharge Batteries to voltage below which they are rated by the manufacturer when measured under load (connected to the vehicle or a charger capable of discharge). Batteries discharged to a voltage lower than the lowest approved voltage may be damaged, resulting in loss of performance and potential fire when Batteries are charged.

4. Don't discharge battery to a level below 3V per cell under load.

For Tattu series batteries which are used for Unmanned Aircraft System, The recommended cut off voltage is 3.5V per cell.

5.Don't leave battery unattended during the discharging process. During the discharging process, user should monitor the process constantly and react to potential problem that may occur.

6. In case of emergency, discontinue the process immediately, disconnect the battery, place it in a safe area, and observe it for approximately one hour. This may cause the battery to leak and the reaction with air may cause the chemicals to ignite, resulting in a fire. A safe area should be outside of any building or vehicle and away from any combustible materials. A battery can still ignite even after one hour.

7. User need to check the conditions of the battery before use it or discharge it. Stop using it if user found the cells are not balanced or cells are puffing or weeping.

And finally, don't over discharge the battery, over discharge the battery maybe let the battery damage or fire, so please take more carefully to discharge batteries

Source: http://www.genstattu.com/blog/how-to-safety-discharge-batteries/

RC CAR Types Introduction

RC car is a popular RC hobby, there are many people play RC car in the USA. RC car has  two power types : Electric and Nitro, here are some of the advantages and disadvantages of each.

Electric
cheaper
“cleaner”

Less Maintence
Better for at-home use
Cars have faster acceleration in general
Limited run times
need to wait hours to recharge batteries
Brushless motors are expensive

RC Car Batteries recommend:

http://www.genstattu.com/car-battery-lipo.html 

http://www.gensace.de/car-lipo.html

(These are two famous RC car battery online shop)

Nitro
Longer run times
nice sound
Need to buy gas
Smells bad (my opinion)
a little more expensive to buy the car
cars are more complex (more can go wrong)

There are many RC  car types like Street, Drift, Buggy, Truggy, Trucks and so on. Today I will have a simple introduction about these RC cars.

STREET

These are your average street cars. They are the fastest and the best on paved, flat surfaces. Do not get this if you are looking to drive in your backyard or want something with more power.

DRIFT

Drift cars are like on-road cars but with slick tires. You can slide around turns and still get almost as fast as an on-road car. They are good if regular cars bore you but you like to drive fast. Drifting is hard, however, so be warned.

BUGGY

Buggies are a cross between offroad and onroad cars. They are the second fastest on road but the slowest offroad usually due to their low wheelbase. Buggies are good for those who cant decide what type of car they want, since they can use it for both.

TRUGGY

Truggies are also a crossover like buggies, but they are more for the offroad. It basically takes the frame of a Buggy and puts monster truck tires on it. These are the 3rd fastest on road and the 2nd slowest off.

TRUCKS

Trucks are your monster trucks. They are amazing offroad but very slow onroad. They may flip a lot when trying to make high speed turns so these are not the best foron road and you should get these if you want to drive in the woods or in the grass the most.

Source: http://rcfpvplane.com/the-rc-car-types/

how to charge lipo batteries

When you saw the article title, may be you will laugh: charge lipo battery is so easy. Connect the battery to charger is drone. Is it really easy? Let us to see the professionals give the complete charge lipo battery needing attention.

1. Only use charger designed for lithium polymer/Lion battery. Do not use a NIMH/ NICD/ LIFEPO4/ LEAD ACID charger. If the charger can support different battery types. Be absolutely sure to select the Lithium polymer (Lipo) mode on the charger. Failure to do so may cause a fire, which may result in personal injury and property damage.

2. User should Always charge Batteries in an open area away from flammable materials, liquids and surfaces.

3. Never charge Batteries inside of the model.

4. Never charge batteries below freezing (0°C, 32°F)

5. Never charge Batteries that are hot to the touch (above 100° F). DO NOT handle Batteries until they are cool.

6. User should Always set the charger to the proper cell count and/or voltage listed on Batteries' labels.

7. User should Always set the charger to the amp charge rate as listed on Batteries' labels.

The charger should never be set to charge Batteries at a rate greater than 1C (One (1) times the capacity of Batteries in amp hours) unless another C rate is specified in the manufacturer's product documentation or the rate is preset as part of a specific battery and charger combination. DO NOT alter the charge rate once charging has begun.

8. Never overcharge Batteries beyond the capacity listed on Batteries' labels.

9. Never overcharge batteries over their rated maximal voltage (4.2V/cell for LiPo).

10. It must choose series charging if two or more battery packs be connected in series for using.

11. Use suitable and good quality chargers, please don't use cheap and low quality chargers, use the professional Lithium polymer charger to charge the Gens ace & Tattu battery. When charging, please make sure the surroundings is clean, without sundries around. Don't charge without monitoring. Using lipo sack is suggested when charging to ensure the charging safety. Stop charging timely when the battery is fully charged. Do not connect the charger and the battery for a long time when the battery is fully charged. We will not be responsible for any personal in jury and property lost or any kind accident that caused by improper charging.

source: http://www.genstattu.com/blog/how-to-charge-lipo-batteries/

Repost-Gesn Ace Tattu 3.7V Lipo battery Introduction

This article is wrote by dronebattery.wordpress.com, it is talking about Gens Ace Tattu 1S Lipo batteries, you can click this link to view the original text:

https://dronebattery.wordpress.com/2017/03/18/gesn-ace-tattu-3-7v-lipo-battery-introduction/

As we know, Gens Ace Tattu is a professional Lipo battery manufacturer for RC include Rc cars, drones, rc airplane, rc heli, rc boat, UAVs and so on. And there are many different specs batteries on sale on there online shop genstattu.com, there are different capacity, voltage and discharge rate. Gens Ace & Tattu are two different Lipo battery brands, Gens Ace is mainly designed for Rc cars, and Tattu is designed for drones. Next let me introduce the 3.7V Lipo battery on Gens Tattu online shop.

3.7V Lipo battery is the lowest voltage of Lipo batteries, we also called 1S Lipo battery =3.7V Lipo battery, 2S Lipo battery is two 3.7V Lipo batteries in series, and 3S Lipo batteries are three 3.7V Lipo batteries in series…

There are are three 3.7V Lipo batteries on GensTattu online shop, Let me know more about them.

Gens Ace 7000mAh 3.7v 50C Lipo battery

Full name is Gens ace 7000mAh 3.7V 50C 1S2P HardCase Lipo Battery Pack 58# with deans plug on GensTattu, this is a hardcase Lipo battery with high capacity and high discharge rate, it is mainly suited for RC cars.

Capacity: 7000mAh

Voltage: 3.7v/1s

Discharge Rate：50c

Price: $25

Shop link:http://www.genstattu.com/ga-b-50c-7000-1s2p-hardcase-58.html

Tattu 220mAh 3.7V 45C Lipo battery

Full name is Tattu 220mAh 3.7V 45C 1S1P Lipo Battery Pack with Eflite Stock Connector (1pcs), this battery is mainly suited for tinny whoop,small handsized quad.

Capacity: 220mAh

Voltage: 3.7v/1s

Discharge Rate：45c

Price: $4.99

Shop link: http://www.genstattu.com/ta-45c-220-1s1p-1pcs.html 

Tattu 550mAh 3.7V Lipo battery

Full name is Tattu Plus 550mAh 3.7V Lipo Battery Pack, this 3.7V 550mAh Lipo compatible with Jumping Sumo and Rolling Spider MiniDrones.

Capacity: 550mAh

Voltage: 3.7v/1s

Discharge Rate：

Price: $7.19

Shop link: http://www.genstattu.com/tattu-plus-550mah-3-7v-lipo-battery-pack.html

If you want to know rc Lipo batteries, you can visit Gens Ace Tattu official online shop:

USA Online Shop: http://www.genstattu.com/

Europe Online Shop: http://www.gensace.de/

How to build Rotorx Atom V3?

RotorX Atom V3 is a 122mm Mini Quadcopter and weights less than 250 grams, it is very small and light. About such miniquadcopter, how to build it? This guide is tell you how to build a  Rotorx Atom V3.

Before to build  Rotorx Atom V3, you need prepare some Materials.

Quadcopter Materials:

FC, ESC's, T-Motors 1406kv Motors, OSD, VTX, FPV Camera, Frame, Canopy

DSMX Compatible Radio, Goggles

Motors, Props, Flight Controllers, ESC's, Canopies And OSD/VTX Boards;

You can buy these materials form Flitest.

Battery:

About batteries, you have two choice 3S Lipo pr 4S Lipo, if you want to use this quadcopter to racing, I advise you choose 4S Lipo.

I recommend you these two batteries:

3S Battery: Tattu 850mAh 4S 45C Lipo

Sales link: 

http://www.genstattu.com/tattu-850mah-11-1v-45c-3s1p-lipo-battery-pack-with-xt60-plug.html

4S Battery: Tattu 850mAh 3S 45C LIPO.

Sales link:

http://www.genstattu.com/tattu-850mah-14-8v-45c-4s1p-lipo-battery-pack-with-xt30-plug.html

Tools:

2mm and 1.5mm hex driver

Solder

Soldering iron

Heat gun

Wire snips

Wire strippers

Loctite

Everything have prepared, new lets begin to build RotorX Atom V3.

First, solder the XT30 power cable on the base layer

Next, select your antenna and connect. Note: DO NOT power on without the antenna being in place because it can damage the VTX. 

Attach the plastic base plate to the cube. This part helps protect from carbon and prevents shortages. To attach, use two short, flat screws in recessed holes to secure. Screw the positive nuts on the cube—they are marked with “+”. Then place double-sided tape on the bottom of the cube. This isolates the screws from the frame.

Use two plastic screws to secure the cube to the from into the “-“ nuts. Make sure you secure them firmly.

Tin the ESC solder pods.

Extend wires on motors. (Watch video)

Connect wires on front of quad

Attach motors to the frame with the longest screws and use Loctite.

Install receiver. As long as it fits under the canopy, anything goes. (Including: PPM, SBUS, Spektrum) There are three pads to solder to if your RX doesn’t plug in properly.

Attach the camera. It has three different mounts (15, 30 and 45 degrees). Only permanently glue in if you don’t want to change the tilt. Note: hot glue is a good option to use because it’s less permanent.

Plug camera into front left bottom plug.

Use long M3x12 screws to hold the camera in.

Install LED and route antennas.

Install canopy.

Ensure the wires aren’t pinched.

Route antenna.

Plug in USB and connect to BetaFlight. Plug in battery. Go to motor tab and test motor direction. If your motors aren’t correct, you can check in BLHELI.

Bind and configure the Atom V3.

Set-up switches and configure end points to the DX6.

To enter the OSD turn on quad and radio. Hold left on the yaw axis and count down. Navigate up and down with the pitch. Confirm with roll axis, which goes back or exits out of the configuration.

Install propellers–AND FLY!

IHere is a video about Rotorx Atom V3:

If you want to know more about these, you can go to visit http://rcfpvplane.com/diy-rotorx-atom-v3-build/ There are many guides about build drones.

Get good Lipo battery and Charger for Racing Drone

As we know, Lipo battery is very important for rscing drones, if you want to win a drone racing, get a good Lipo battery is very important. But how to choose a good Lipo battery and how to care our Lipo battery? Next let me introduce the Lipo battery and charger for racing 

drone.

Even if you buy a pre-built drone like the Vortex 250 Pro or Vendetta, racing drones like these don’t come with batteries. I won’t go into all the specifics on how to pick a good LIPO Battery in this article, but just know that the most common battery for a racing drone is 14.8v 1300mah 60C. A battery with specifications like this will give you the best power-to-weight ratio for the drones we recommend and the higher C rating means that it will handle higher currents and last longer than a battery with a lower C rating. I recommend Tattu 1300mAh 4S 75CLipo battery and Tattu Rline 1300mAh 4S 75C Lipo battery.

Get at least two or three batteries to start with, since flight time on a racing drone is very limited and you’ll need as much practice as you can get. You can buy even more batteries in the future, but if you have more than just two or three, you’ll need to look into Parallel charging so you don’t spend 10 hours trying to charge all of them. One thing you should buy (no matter what battery you get) is a voltage checker. LIPO batteries do not like being over discharged and can even break if discharged too much. It doesn’t really matter what kind of LIPO checker you get, but the Gens Ace & Tattu LIPO to USB voltage checker is nice because it can also turn your battery into a Phone charger!

A Good Charger

Don’t buy a $15 charger. You will regret it! LIPO batteries are not like AA batteries. They should be charged and handled with care and never overcharged. With a good charger and a little common sense, LIPO batteries are not a huge fire hazard, but using a cheap low quality charger can be extremely dangerous. Get a good charger (nothing cheaper than $30), read the manual and everything will be fine.

If you plan on charging more than one battery at a time, buy a parallel charger and watch our video about parallel charging. For parallel charging, you’ll need a charger that can output at least 8 amps. That should be enough to charge up to 6 of the batteries we recommended in about an hour. If you plan on charging even more than 6 batteries at once, or charging at a faster rate, higher amp output is always better. The EV-Peak C4 is a good starter charger, but you can always go crazy and get something like the EV-Peak SD1.

Racing Drone Lipo battery online Shop:

USA: http://www.genstattu.com/

Europe: http://www.gensace.de/ 

The type of ESC and Tattu ESC

How many ESC (electronic speed controller) types? Maybe you have been confused by this question. Today we will help you to clearly know more about ESC.

1. ESC types

#1 Brushed and brushless

For base on motor, which can be divided into brushed and brushless. It according to the control signal to adjust the speed of the motor.
For their connection, usually goes like this:
- The ESC input line connected to the battery;
- The output of the ESC line (brushed have two lines, brushless have three lines) connected to the motor;
- ESC signal lines connected to the receiver.

What's the difference between brushed and brushless ESC?

Brushed Motor and Brushless Motor is like Hub and Switch in Computer Network. Brushed Motor is just a normal motor where it work by direct current/voltage (We only focusing in DC area. NO AC Motor)

#2 Blheli, simonk and kiss firmware

ESC program is divided into open source and not open source, For base on open source firmware, there are 3 main types of firmware that you can get on your ESC, which can be divided into blheli, simonk and kiss firmware.

#3 BEC and UBEC

BEC stands for Battery Elimination Circuit. In practice, this simply means that ESCs with a BEC are able to output a constant voltage and so power the equipment on board your flying platform, such as your receiver, servos or flight controller. Delivers power for your Rx and servos at ~5v (but usually no more than 2A-3A).
UBEC stands for universal BEC or sometimes ultimate BEC, which is typically a switch mode unit which is capable of reducing the voltage from 4s+ packs to the required ~5v, and can deliver as much as 10A to power many, big, digital servos and your Rx.

2. What type of ESC do quadcopters use?

BLHeli is the most common firmware being run on multirotor ESCs today. It's popularity is pushed further by support for what is called "BLHeli passthrough" built into any CleanFlight based flight controllers. What this allows you to do is to program and update all of your multirotors ESCs from the computer connection to the flight controller.
For BEC or UBEC, you really need to make sure which one you have or are buying if your goal is to have the better switching mode instead of the more problematic linear mode type BEC. Like a lot of things in RC, you have to study the words and numbers a little (types, input voltages, output voltages, ratings, etc.) to make sure you get what you need.
Brushless motors are typically 85 - 90% efficient or more, higher efficiencies for a brushless electric motor, of up to 96.5%, whereas DC motors with brushgear are typically 75 - 80% efficient. Brushless DC motors are commonly used where precise speed control is necessary. So base on the brushless motors, you should have to choose the matching ESC, which also is brushless ESC.

About Tattu 30amp ESC brushless Blheli

Tattu ESC Specifications

- Firmware: BLHeli_S V16.6 A-H-20
- Max continuous load: 30 amps
- Burst Current: 40A / 10sec
- Lipo Cells: 2 to 4 cells
- MCU: SILABS EFM8BB2 48MHz
- BEC: No
- Weight: 3.6g (board) 6.5g (total with wires and connectors)
- PCB size: 26mm L*14.5mm W
- ESC height: 6mm
- Signal wire: 150mm
- Power wire: 100mm

Suppot regular 1-2ms pulse width input, as well as Oneshot125 (125-250us), Oneshot42 (41.7-83.3us), Multshot(5-25us), Dshot150, Dshot 300 and even Dshot600and automatically detected by the ESC. High quality N-FET, half-bridge drive and PCB specialized for cooling, only flashed with BLHeli_S firmware.
Source: http://www.genstattu.com/blog/what-the-type-of-esc/