Hi,

I am new to the RC world and planning to buy my first RC TX/RX, i have zeroed down on FlySky FS - T6 2.4Ghz. But i am a bit concerned about the battery requirement.

Would like to know what kind of batteries can be used with FlySky FS-T6? Would appreciate if FlySky FS-T6 owners can help me out with the following queries.

1. Best AA batteries for FlySky FS-T6.
2. Has some one successfully done a battery mod for the transmitter? (something as mentioned in the following link: )

Thanks in advance.

Regards,
Cyrus

Welcome to RCI, Cyrus.
You can use the search option to get details about this specific radio - it is discussed in so many threads.
I use this radio.

You have two options to go with, Rechargeable cells, or Dry cells.
I recommend Rechargeable batteries, as it will help save some money in long run.
For Drycell, You can get any AA battery x 8No.s

But if you prefer rechargeable battery, there are many option, Like NiMH, NiCad, LiPo, LiFe etc.......
If buying NiMh or NiCd cells or battery packs, get 8 No.s .
For LiPo and LiFe, A 3S Tx pack will do.

I recommend buying a LiPo battery, as it provide long play time,

But finding a pack that fits inside the battery bay of FS-T6 is difficuilt, some Tx packs Like Turnigy 1450maH 3S Tx pack is proven suitable.

Alternatively, you can do something Like this.
http://www.rcindia.org/batteries-and-chargers/diy-transmitter-battery-pack-from-mobile-phone-batteries/msg200960/#msg200960

Regards,
SPN

@sooraj.palakkad, thanks for your reply, i appreciate it.

I have few queries though.

1. For rechargeable battery (NiMH, NiCad), any particular brand that you would recommend, which is easily available in Indian market and is cost effective? 
2. For Turnigy 1450maH 3S Tx pack, I understand that we have open the TX and make changes, do you have any tutorial for that?
3. Regarding your post "http://www.rcindia.org/batteries-and-chargers/diy-transmitter-battery-pack-from-mobile-phone-batteries/msg200960/#msg200960", its interesting, can i have more details on the battery pack and how did you connect it to the TX?

thanks in advance...

Regards,
Cyrus

Well, If you plan to get AA size NiCad or NiMh, get anything - It's cheap, 40-50 Rs. per cell.

If you are making your own Battery pack out of Mobile battery (As I did), Or is Buying a LiPo or LiFe pack, you have to solder a connecter to the battery terminals, Opening back cover of the battery pack is not at all necessary - But If you like a clean work, You can add a connector with out soldering, By opening up the Transmitter.

I will post some pics soon

GP godrej power ultra from flipkart. costs just 100 per cell, ie 800 for 8 cells. this is the best investment for a flysky fs t6. recommended it to more people and everyone is satisfied.
i personally do not like/recommend lipos since there are lot of stories in this forum of dead lipos in tx or dead tx with lipos(I was forced to use lipo after switching to 9x since it eats juice like blackhole, wouldnt last even for an hour)
a 1600mah AA nimh will last more than you think.!!!! and too, as a beginner, battery mod and fiddling with lipo is just not worth it.

I agree with it, But if he has basic electronic skills, There is no problem making his own battery pack -
One thing that to be taken care is, the total battery voltage should be below 13V and polarity is not reversed.

P.S I too am a beginner to RC , this is my first radio and I had no budget to buy a LiPo pack, So I made this battery pack, and till now it is going fine.

why bother when there is a easier and better way around, reason why i recommend Nimh on this particular tx,

open up the case, connect your lipo(11.1V) and feel the warmth in the ICs , especially the power regulators.
though theoretically you can connect a battery of any mah capacity and correct voltage, in reality you cannot do so.
the theory that electronic stuff will take only the required amount of current is usually dependant on the internal resistance of the IC, so connecting a 3000mah lipo or a 1000mah lipo that can supply up to 40-50Amps to a device that only needs 500milliamps will put the device under lot of unnecessary stress and gives out lots of heat. these small devices are not designed so.
in turn, ask your local UPS vendor that if you can connect a pb battery of 120Ah to a small ups of recommended range 60Ah. the answer should be no. though theoretically it will increase the run time, in practice you will get lot of hum in the output and the device may fail prematurely.
certain TX (Tgy9x for example) are  designed to take lipos and their internal resistances are definitely high which explains why lipos go with them happily together.
so its your take to risk with a radio.

Ashok.P

I agree with v2 eagle. Even the guys at RCBazaar (when I asked about LiPo for the RCB6i) said that it is not good to use batteries with high discharge rates (20-60C) for a device that needs so little current. Alternatively find a Tx specific LiPo (1-1.5C).

@v2 eagle,
Please see pm.
Regards

Ashok sir, I can't agree with that, All these transmitters have a 5V voltage regulator inside. (78M05) which is just a linear positive voltage regulator that can accept up to 35V I/P (For 5 to 18V regulators).
And this IC never unnecessarily heat up - it heats up only when the O/P circuitry is Taking more than the rated o/p current, which is 350mA,
The Transmitter is designed to take in any voltage from 7V to 20V.

It is a common misconcept, that when we use, a More Discharge rating battery than the rated one, it will damage the circuitry, In fact it wont.
The batteries discharge rating states only the max. current it can deliver to a load .
It don't mean it will force the whole power of it to flow through anything we connect it to.

The Regulator IC heats up only when the Load connected to it's o/p draws more current than the regulator can deliver (which is 350mA in case of 78M05),
It won't heat because we connect High voltage or current that is more than required.

P.S : But the max I/P voltage for this IC is 35V,  safe zone is 7 - 20V , refer datasheet.

@Ashok sir, just pointed out the fact,
You are a senior member here, I am a beginner to RC, But have some knowledge in electronics,
So I said my opinion, I came across this misconcept so many times ......

Correct me if I am mistaken.

I want to see some clarification on this. Now I am puzzled.  I just posted what I was told. I would love to know if it is a misconception.

It is a misconcept, dude  - -
What kind of clarification I can provide , I don't know.
I can show that the rectifier IC is 78M05 and it's datasheet also, But still It will solve the case in transmitter only,
In fact, It is the basic in electrical technology.

Your reasoning makes perfect sense. It was just what I had heard. I am sure there is some reason there are specialised Tx packs though. Is it to reduce costs by reducing discharge or is it something to do with self discharge of the LiPo- maybe lower discharge rating means less self discharge?

@sk1701
Yes and yes!

Oh dear Sooraj.
If you want to reinvent the wheel by risking a TX, you are most welcome, I hope you understand what i mean.

Plus. being a senior member doesnt means that i does knews everything. the above statement is made by me after experimenting with a fst6 and zippy lipo. yes, i do experiment and talk about it. im lucky to have not burnt the tx so far and it rests now with another member here and working fine till now.
but that does not recommend a long time usage. AND, if the tx stops working suddenly , you cannot make a decision what does it to you. i am working with electronics from 6 year and up and still counting.(and that doesnt qualifies me to make a costliest experiment, so if the manufacturer recommends something, Stick to it!!!!)

P.S: im no vendor of G.P batteries not ambassador of flipkart !!!!!
Ashok.P

  with v2eagle. I also use the same AA batteries. Not the flipkart ones but the locally available ones. Rechargeable Beston 2100mAh.

I bought My radio (FS-T6) a month back from Arun.sreelakam, which was in unused condition,
Thhanks to him for the cheap price, because I had only little money with me, which I made by Working along with my college,

Do you think I will risk damaging such a Hard earned equipment !!.

But, as an electronics enthusiast from childhood, I couldn't wait for looking under the hood of the transmitter, I unscrewd it on the first day I got it in hand - Made some modes, soldered a Battery connector - the main reason I made a battery pack is because my pocket were already empty .
Well so far I didn't come across any problems, No heating, nothing. And I am pretty sure this Tx wont be damaged until unless I connect the battery in Reverse even this wont fry the Tx, but may burn the Voltage regulator - ,also if the worst happens, I will repair it and get going on the next day itself !.

Well, nobody says so , Your effort to help newbs is always appreciated

The mod that you are talking about was with cellphone batteries if im not wrong, those discharge ratings are far less than RC lipo. in fact they should be lion not lipo.
im glad that you could repair your own equipment. im sure i too can with hours of my exp in SMD and cell phone repairing , but i dont want to. that s the point here. and there is no fun in repairing a bugged electronic equipment , specially after letting the magic smoke out, and the terror look in your face hoping all the god to make it work...

Edit:
 that ambassador thing was intended to be funny.!!!!

What  you intended to be funny, is taken only as fun pls see PM

Yes I used Cellphone batteries, chinese ones, they are of low discharge rating.

Li-Poly and Li-Ion with the same amount of mAh are equal in power storage capacity, and the voltage are the same (3.7 volts per cell). The difference between Li-Poly over Li-Ion is the fact Li-Poly has a slightly higher amount of energy density, and the materials used allowing it to be shaped differently than Li-Poly.

Lithium-Ion Batteries began their development in 1912. However, they did not become popular until they were adopted by Sony in 1991. Lithium Ion Batteries have low energy-densities and cost less than lithium-polymer batteries. In addition, they do not require priming when first used and have a low self-discharge. However, lithium-ion batteries do suffer from aging – even when not in use.

Lithium-polymer batteries can be dated back to the 1970’s. Their first design included a dry solid polymer electrolyte that resembled a plastic film. Therefore, this type of battery can result in credit card thin designs while still holding relatively good battery life. In addition, lithium-polymer batteries are very lightweight and have improved safety. However, these batteries will cost more to manufacture and have a energy energy density than lithium-ion batteries.

 
why would i stand a lecture like this?
ask me to withdrew and i will happily do so.

okay, does allenvandessary really belongs to our age? see the complete article,
Lipos are safe, low energy density than Lion?

Ashok.P

I think we have strayed from the topic. Before the debate gets any more heated, I think we should get back to what I think is the main issue here- the discharge rating. Since Iyer Sir agreed with one of my earlier posts, I understand that Tx batteries are made with low discharge ratings such as 1.5C in order to cut costs and minimise self-discharge while in the Tx. Thus Li-Ion batteries ought to be safe to use due to their lower discharge ratings. I am still not sure what the impact of using high discharge batteries would be and whether they  would harm the Tx (or more likely, the LiPo itself). I am awaiting a response from Iyer Sir on this.

Electrical theories are still true, and is not rewritten , as far as I know , till now.

Powering a Tx with a Battery pack of High discharge current has nothing to do with damaging it.
If you reverse engineer the circuitry in power supply section of any radio, you could see, the battery +ve terminal directly going to the 78M05 and a branch from it goes to the voltage monitoring circuit (usually analogue i/p of micro controller through a divider network) . So if the I/P voltage exceeds a specified level, the voltage to the voltage monitor circuit increases and there is chances of burning the Microcontroller , But still The 78M05 will function with out any problem as it's max. I/P voltage is rated 35V !

So only High voltage than 13V can cause any problem to a transmitter, Supplying any amount of current won't do any harm,unless you reverse the polarity .

The reason for making special low power Battery packs is not mainly cost reduction, but  making it light weight and compact to fit in a battery bay.

This is copy of PM i send to Ashok Sir.

Sorry I don't get that

As I said in my previous post, I now suspect that using a high discharge LiPo may damage the LiPo and not the transmitter. This is because high discharge LiPos have a higher self discharge rates meaning that unless they are checked regularly, they may even discharge below 3V per cell. I am not sure what the self discharge rates would be like but if it is sufficiently high, there may be no advantage of using a LiPo over NiMH cells. Also I am not sure what effect this self discharge would have on the Tx circuitry. Again, I am not sure of the specifics and this is just my chain of reasoning.

It is always recommended to remove LiPo battery from the circuit as soon as it finished the use, because of this.
We know LiPo packs get damaged if we forget to remove battery from a model for few hours, I lost one of my pack like this.

But My cellphone pack has no such issues, I put the battery on the Tx itself for days, no any self discharge - As it is Li-ion cells.

Have been using a 2650mah 3s lipo in my Hitec Tx for a year now.
First charge lasted 3 months ( say 10 sundays of flying x avg 5-6 flights).
Nowadays i charge it about once a month.
I charge it only upto 12v as shown by the B6 charger.
The Tx display however shows only 11.81.
In a month it typically clocks 5-8 hours incl flying, testing at home and simulator use by better half.
Only once after several hours of sim did it go down to 11.1.
Normally never goes below 11.31.
Found it a more than ideal replacement for my original Hitec 1300mah Nimh pack, which after 7 years started needing charging every saturday night!

Edit: Never needed to disconnect for fear of self discharge or any other reason. Of course if i would disconnect if i had to store the Tx...

@Iyer sir, just for confirmation, was that a normal Tx pack or One with high discharge rating ?

There is no problem if you charge the pack to it's optimum voltage (12.6) even this voltage is safe for the transmitter.

I get good results with my mix matched Battery pack (even the cells are not of same capacity !) gives me back up for so many days, I Charge it completely (to 12.6V) in normal LiPo charging mode at 1C .
No heating - no problems. At first I usually checked the state of battery periodically while charging, now I am confident with this pack and leaves it for fully charging with out fear.

1C transmitter pack.
(Caught me there!  )

Well, still no proof to Ashok sir

So seems I have to put in my 2200maH 30C pack in to the Tx for concluding this !
But I can't close the Lid with it

I have a Lipo 3S 2200mah tx battery pack which will perfectly fit in this transmitter. Will explain you everything about it. Even will provide a charger for same not an issue. Contact me for details.!

link battery you mean LiPo ?
is that turnigy 1450mAh pack ?

Lipo 3S 2200mah tx battery pack

@radiocraft can you tell me how much with the Lipo pack cost and how much for the charger..?

dude, that pack isn't suitable for FS-T6

Sooraj, is turning 1450 pack suitable for fs t6??

Well my battery pack is completely suitable for fs-t6. This radio needs 8 batteries right. And this lipo is equivalent to it.
I guess you wanted that battery. But you back off. The dimensions required are perfect.

Well, Turnigy 1450mAh fits FS-T6 and HK 6Ch radios,
Is the dimensions same to 1450 ?
I mean the width of pack should be less than 15mm.
pls confirm.
If it is, I am extremely sorry for the above post,

13 mm width. And I have hobby king transmitter and I had uploaded photos also earlier u didn't check .?
http://www.rcindia.org/index.php?topic=18774
Go here post no 11, see pics.! U will get it ... Don't be sorry. Just get knowledge .!

forgot it bro.
This battery is perfect for the mentioned transmitters.

Latelt been asking this, where did you manahe to buy this radio in India?  I am so looking for it, I found it on nitro rcx for 20$ but they are not shipping it in India

Trying to import radio equipment is generally a bad idea. It is usually caught by customs who then require a WPC certificate. See this to find some Indian dealers though at most places, FlySky radios are out of stock: http://www.rcindia.org/rc-outlets-and-resellers/mega-list-of-all-rc-outlets-in-india/

@chintan joshi , you mean FS-T6 ?

Yes, I meant that @sooraj bhai

Thanks for the suggestion SK1701

I agree with this. The regulator IC won't just heat up only because its input is connected to a battery of high discharge current capacity. The regulator will go bad only if the output circuit is overloaded. I am using a FlySky FS-T6 with 3 Li-Ion cells connected in series (12.6 volts at the max).