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.

Quote from: v2 eagle on November 28, 2014, 08:49:29 PM

okay, does allenvandessary really belongs to our age? see the complete article,

Ashok.P

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

Quote from: sooraj.palakkad on November 28, 2014, 04:56:42 PM
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.

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).