Battery help please

[leons]

If a Heli battery is rated.... Li-Polymer Battery 11.1V 15C 2200mAh.

What other batteries can be used..and what are the advantages...or disadvantages...

Thanks...Leon

[raptorheli2]

you can use any 3s 2200mah ish lipo so long as it will fit in the heli and is of an acceptable weight.

15c is the rating of how many amps the battery can deliver. so in your case it is 15c which means 15 x 2200mah = the max amps your battery can deliver.

modern lipos are upwards of 35c so you will get much better performance from changing packs.

hope that helps.

cheers

[leons]

Thanks,

""modern lipos are upwards of 35c so you will get much better performance from changing packs."

Confussed....Could I use a..example 4000mah...providing the fit/weight is ok

What relavance is the "C"

At what stage is a battery likely to be too "powerful" for the 5in1

Thanks...Leon

[Balders]

in laymans terms, the C rating is how fast it can discharge, the mAh rating is how much charge it holds.

So in other words, a 4000mAh pack will last longer than a 2200mAh pack if you are using the same amount of power (ignoring weight differences).

However, if you run the 4000mAh pack in all sorts of high-drain moves, it will last a lot less. The C rating basically is just how much power you can extract.

Think of the mAh as the size of your fuel tank, and the C as how thick your fuel pipe is

[gorber]

The C rating is how many times it could notionally discharge itself in one hour. So, as Raptorheli2 said, along with the capacity, it defines the maximum current flow.

If a battery is, say 30C and 2500mah, it has a maximum current flow of 30 X 2,500 mA = 70A.

[raptorheli2]

if you can fit a 4000mah lipo on it and it's not too heavy then yes it will work.

the important thing is you do not go over 3s as over voltage will ruin your day.

the C rating is the battery mah's multiplied by the C rating.

so the continuous power your battery can deliver is 15 x 2200mahs.

a 35c battery would be 35x2200mahs and so on. this isn't how long the battery lasts but how powerful it can deliver the power.

i don't know what a 5 in 1 is sorry.

cheers

[leons]

In my mCX2 the 5in1 is the control unit...does it have a different name for different Heli`s..

Thanks everyone for the help...
Appreciated..Leon

[cjcj1949]

Batteries and 5 in 1

Yes. Most larger helis have separate units. The rx, esc, gyro and servos. The 5in1 has them all in 1. On the mcx you can get a 165mah 27C battery for about £3.50 each in a two pack. Mine are Overlander. They are a lot better than the originals.

Chris

[leons]

I have to agree about the Overlander Batteries, I got two packs when I first got the mCX2...

Thanks for explaining the 5in1 set-up...

Leon

[asomaro]

Hi Leon,

Take a look at the following link:

CustomHeli.co.uk

Loads of very helpful info about lipos. Take a look round the rest of the site - you will find a lot of helpful stuff there

Cheers

[leons]

Hi Leon,

Take a look at the following link:

CustomHeli.co.uk

Loads of very helpful info about lipos. Take a look round the rest of the site - you will find a lot of helpful stuff there

Cheers

I think I must have to register..What ever I click on it says

There are no products to list in this category.

Leon

[moyesboy]

The C rating is how much current can be pulled out of your pack.
A 3S 2200mAh 15C can, in theory deliver 33A without being damaged.
That sort of battery would be used in something like a trex450 which at a high head speed will draw something like 15A in the hover and 30A or more on full pitch. a 3D pilot will use up 1760mAh out of such a 2200 pack (you should leave 20% in it) in 4 minutes. That is an average current of 26.4A.

Sorry if its complex, but what I'm saying is on a 450 heli you can hover about and learn with a 15C pack like that, but you want something like 25C if you are going to do 3D.

The C rating was supposed to be the max continuous current, and often they will say 25-35C, meaning it will take 25C continuous, and 35C for a short "burst".

When you pull more current the battery starts to get hot. This shortens the life of the lipo. Eventually if you exceed the C rating the battery will swell up and in extreme cases it might literally "burst".

When the battery approaches its C rating it fails to deliver, the volts drop off due to the internal resistance. So by using a higher C rated pack, although it doesn't start with any more volts, or contain any more MaH, when you are running the volts stay higher so you get more useable performance (more head speed for the same throttle). Yuo may also get less reduction in performance as the pack runs down.

So use a reasonably high C rating pack (more than you need in theory), and check how hot it is at the end of the flight. It shoudln't be more than warm to the touch. If it is you may be shortening its life - which is typically 100 cycles (if you get more, regard them as free extras).

The problem is higher C means better performance so often the claimed C rating is over rated. A pack may swell and degrade when used below its claimed C rating- becuase the folks were exaggerating when they stuck the C rating label on it.
Some packs give remarkable performance but rubbish cycle life. Other are steady performers through the flight and last many cycles, and some go like stink for the first part of the charge and then fall off quite a lot.

These are the differences between the different lipo brands. Price is not always that good a guide.

[leons]

Many thanks moyesboy....

So when learning to hover a 450 a 2200mah..15c>>25c would be fine...with another one spare/on charge...

Leon..

[J-S-Q]

Many thanks moyesboy....

So when learning to hover a 450 a 2200mah..15c>>25c would be fine...with another one spare/on charge...

Leon..

Keep in mind that the battery will give you a flight time in the region of 5 or 6 minutes (depends on many factors but that's a ball park figure) and it will take around an hour to charge (although it can be possible to charge faster depending on the Lipos you have).