hello friends..


i have a silly doubt regarding lipos...


is there any difference between TX-LIPOS and the normal LIPOS used in planes...?



can we use the TX-LIPOs  in planes...?   


hoping for good answers...
and correct me if i am wrong any where...
regards
tejas

the major difference is the "C" rate as Tx's don't need that much of a current so a Tx battery will be like 1C-5C ,whereas normal lipo batteries are 15C-30C etc.
Also there may be difference in Chemistry,hence the voltage..

I also read somewhere that Tx Li-Po battery packs also have built in balancing circuits.

Rao 

The big difference is the lower C rating, so they may not be able to supply the amps required for most brushless electric setups. 

SOME of them do have built-in balancers, but that is helpful during charging and should not affect their use/discharge.

thank you all...for giving me this info...u all saved my money on buying the wrong battery...
thanks a lot
regards
tejas

Thejas..there is an easy way to find appropriate battery pack, for our use. most of the electronic equipments came with its specification, on or over the cabinet,or in it's instruction manual.before LiPoly battery packs, all we were using Ni Mh battery packs along with Ni Cd battery packs. its a huge subject to explain about the types of batteries, so you can reffer a good text book at engineering library. anyway, all battery packs are designed for only one purpose.to provide DC electricity when in need. this will be on the basis of the type, numbers, size, and configuration.you never think that only lipo is ultimate. you can use a good SLA battery,(Seald Lead Acid Battery),in to 12 volts, for your need, but in aeromodeling it will be a difficult task,because of the weight.all we know, ESCs are designed to work from 6 volt to 18 volts in most cases.but from 9 volts to 12 volts are safest range.in boat or ship modeling the weight and size of the battery pack, will not be an issue, if you are making a big craft.but in aeromodeling we must find some good LiPo batteries for weight reduction.

whenever you decide to buy a battery pack, or a Cell,(if your battery pack is only one, it will be called as CELL but not as battery),you must consider the need of the battery pack,size, and ampere rating.Ampere rating is the capacity of the battery,means, for an example, imagine that you have a radio, which consumes 9 volts, 1 Amp/H . means, the needed potential difference of your device is 9 volts, and it will drops 1 Amp/H, ( 1000ma) in an hour. more clearly,if you use a battery with 9 volts and 1000 mA, you will get around 1 hour of operation time. this timing will be based on the circumstances of the use. when heat goes up, or cold deeps,for an example,the character of the battery also changes.

so, while buying a battery pack,please consider the consumption rate of voltage and amperage of your unit.fixing a high capacity battery to a low power application will be catastrophic.and vice verse.LiPo batteries are so sensitive to charging currents.so, while charging back, we must take extreme care to avoid over current, over temperature etc...
so all LiPo battery packs are protected by a built in electronic circuit,for charging, but a fuse link on to main outlet leads. these prevents the short circuits and explosions.because of this you can see two different types of wires on your LiPo battery packs, one will be with two or three thin wires, attached to a flat connector, for recharing while two thick wires for out puts.recharging through the out put wires will be dangerous...as it can destroy the battery...it bulges..and ultimately explodes...

then, whenever you buy a battery pack, for a given instrument you must refer the instruction manual of the same unit, for the parameters referred by the manufacturer.the TX , only drops around 800 to 900 mA, while an ESC with motor, will drop more than 12 to 16 amps (12,000mA and 16,000 mA),at load...so take care...have a nice flight.

Quote from: roopeshkrishna on July 30, 2011, 11:47:43 PM
fixing a high capacity battery to a low power application will be catastrophic

charging through the out put wires will be dangerous...as it can destroy the battery...it bulges..and ultimately explodes...

A higher capacity - by which one means greater current rating - will cause absolutely no electrical problems.

The output wires can be used for charging. Just need to use a proper charger which carefully monitors the voltage and charge current and regulates it automatically. The thinner wires are used for balancing the cells.

Sushil Sir..thanks for the guidance for my wrong words..thanks once again..

sushil_anand  beat me to the punch. He's correct. You can use a 5000Mah battery to power a radio with no problems (except on of physical size) but you can't use a TX battery to power a plane or boat.

As for the inbuilt balancing circuit in TX Lipos, I'ts a dubious claim, I've seen the same claim and thought at the time it could be bad advertising. I'm sure any added circuitry would conflict with that of the charger. Modern chargers already have a good balancing circuit, using two together could cause problems. Id like to pull one apart and examine it to find out what it consists of. It could be just a ploy to get Hobbyists to cough up for a rather expensive battery. I believe it's used to convince users they could charge the battery whilst still in the radio. Even so, the charger used would still have it's own balancing circuit so having it's own would be a waste of money.

Remember one thing, China has no regulations regarding "Truth In Advertising". They can make whatever claims they like and there's noting we can do about it. Reading the statements regarding motors which have Japanese bearings, each motor is balances and checked prior to being sold etc. etc. If that's the case, why do so many of those motors suffer from failed bearings, overheating and vibrations? It's wise to take many claims by Chinese traders with a pinch of salt. :-)

I disagree!! why cant we use them on planes?? im planning to using them on one of my builds, where my motor draws 17amps max and the battery is 6s 10000mah 3-5c(2s5p)!! so the battery max. continious current is 30-50apms!! my motor at full throttle takes half of that!! so no problem!! and i dont see any other point here!!

http://www.rcindia.org/electric-planes/x-uav-talon-from-rcbazaar-com(my-ultimate-build)/msg210405/#msg210405

regards,
JK

Only partially true. Many Tx packs are just versions of regular Li Pos packaged to match "regular" packs dimensionally. They, usually, have a low 'C' rating of, typically, 3-5 C. In most cases (e.g. aircraft) one actually uses 10+ 'C' or even more. The battery would certainly not be of much use then.

Dedicated Tx Li Pos (link below) do not even have a connector that can supply high current. They are designed for low discharge and will last longer as well as need less "maintenance" than regular Li POs in the designed application.


http://www.hobbyking.com/hobbyking/store/__17825__Turnigy_2650mAh_3S_1C_LLF_Tx_Pack_Futaba_JR_US_Warehouse_.html


And Propfella, balancing circuits do work. All laptop/notebook batteries have them as it is not practical to have individual cell connections available externally for doing this. I would assume that the TX bateries offered with this "feature" would probably not have the external balance connections so no conflict and the convenience of not having to access these otherwise.

it would be simple!! when you use them in parallel, the C rating remains same but the current increases, therefore increasing the max. continious current!!simple if using 3s 3C 2200mah battery, max. continious current is 6.6 amps but when you connect two in parallel get 13.2amps and so on !! the only reason i'am planning to use it on a plane is because it is lighter than the normal lipos and suits my needs!! meaning i can fit in more amps for longer flighter time!!

regards,
JK

I'm not here to argue, You go ahead and use whichever battery you wish subhashjk0508 for whatever you wish. You clearly know more about batteries than myself. Sorry for purposely trying to mislead you.
Good luck on squeezing three transmitter batteries in your plane to achieve your 17 amps :-)

Obviously sushil_anand has had plenty of experience with Lipos also. Therefore I will simply cease trying to mislead you all. I will also stop buying the batteries I use which state they are 60c for my planes and 1C for my transmitter. HobbyKing must be lying about the C rating as well.

Good luck on squeezing three transmitter batteries in your plane to achieve your 17 amps :-)

no hard feeling man!! and anyways im not using only 3 batteries im using 10(2s5p)!! and for instance many of you would have noticed many people use 18650 li-ion batteries for the reason they are light weight!! they are light weight because they have a C rating of around 8C and trying to do the same in lipo is no harm!! and getting back to this, i know many members have more or rather better knowledge about lipos than me!! i just stated what i know and if something is wrong i hope the senior members will correct surely!!

edit:- and i dont think so if people had followed the rule 60c for plane and 1c for transmitter they would have used the 18650 batteries!! if you just look up at endofdays builds at rcgroups you would know!! and as far as normal lipos are considered we cant achieve a flight time of 127mins in quad using them!! its just that we need to try!!

regards,
JK

Summer and its heat seem to have already arrived.

Can one use a normal 3S 20-25C discharge 2200mAh LiPo to power a Tx? Are there any risks involved?

What is the bottom line?

you can use ..... no harm.. and you can fly any Quad or Hexcopter with it  !!!!!

Only precaution is to take care while connecting is the polarity.... harm with wrong polarity with this battery may be far more than a transmitter battery.

I am using one such lipo for my transmitter successfully from last one year.

Quote from: rastsaurabh on January 19, 2015, 03:14:22 PM
harm with wrong polarity with this battery may be far more than a transmitter battery.

@rastsaurabh,
Why? Just wondering if that is true...

the same difference between 5 Amp Plug and 15 Amp Plug.

I can assure you Rastaurabh is definitely correct. Prior to HobbyKing stacking any low C batteries I was using 30c batteries to power all of my transmitters. I had no problems whatever. A friend had a major problem when he connected his transmitter up after imbibing in too many frothy ales. He blew 3 voltage regulators to kingdom come. The same would also happen should you do the same with a 1C battery, possibly not with such a loud bang.

Just for interest's sake, the 9X is extremely straightforward to repair should such a thing happen. I've now repaired 3 of them, on of them twice. (Some people just don't learn) :-)   Stu

Sorry, I missed a straight answer. There is no "bottom Line" as long as the battery can fit and as long a it's a 3s it'll work. Just remember the positive is in the center and negative is to the right looking at the back of the radio.

Many people use the LiFe 3s battery to power their radios. The only advantage is it's not driving the regulators so hard. Plus they aren't so expensive.