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View Full Version : what is better a 20c, 30c or 35c lipo


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SYMAWD
08-27-2010, 09:14 AM
I wouldn't get the 2450 it's probably too heavy. Look at the weight difference on HK's site.

SYMAWD
08-27-2010, 09:19 AM
I looked at the weight and it wasn't a huge difference but it was 28mm longer. So how much room is left under the canopy with the stock batt?

dannylightning
08-27-2010, 09:24 AM
I wouldn't get the 2450 it's probably too heavy. Look at the weight difference on HK's site.

in oz it is 0.39 heavier. that is nothing. it is about 2 inches longer tho.

i just velcored my battery on to the length of the 2450 and there is no way the canopy would go on. i wonder if the t rex 450 canopy would solve that issue, planning getting one any ways.

El Cuajinais
08-27-2010, 11:30 AM
Danny,


I'd go with the 20C simply because I'm getting a ridiculous 12 min flight times out of them. This was with training gear on, and everything stock except the 3 cyclic servos which are Hitec carbonites. I got this with hovering and fwd flight. Fwd flight I would expect to consume less because the translational lift makes the heli fly at lower RPM's. For the same reason I would expect that flying on idle up will reduce the flight times considerably, but I'm not at the point where I can try that. As for the connectors, since you already installed a BEC, I assume you either know how to solder or know someone who does. That being the case, you should consider doing what I did. Just get this:

http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9572 (http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9572)
This is 5 males and 5 females!

And this:
http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10432 (http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10432)
To cover the exposed solder area after you solder.

Now you change the ESC plug and all your other batteries to XT-60. It's cheaper, and lighter than dealing with extensions. In the future when you buy from HK you will not need to do anything. If you buy a battery from another source (I know I won't), you still have left over XT-60's to convert it. These plugs are good, dirt cheap, and A LOT easier solder compared to Deans. (I've never had EC3 so I can't compare to that)

dev400
08-27-2010, 11:42 AM
Danny,


I'd go with the 20C simply because I'm getting a ridiculous 12 min flight times out of them. This was with training gear on, and everything stock except the 3 cyclic servos which are Hitec carbonites. I got this with hovering and fwd flight. Fwd flight I would expect to consume less because the translational lift makes the heli fly at lower RPM's. For the same reason I would expect that flying on idle up will reduce the flight times considerably, but I'm not at the point where I can try that. As for the connectors, since you already installed a BEC, I assume you either know how to solder or know someone who does. That being the case, you should consider doing what I did. Just get this:

http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9572 (http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9572)
This is 5 males and 5 females!

And this:
http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10432 (http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10432)
To cover the exposed solder area after you solder.

Now you change the ESC plug and all your other batteries to XT-60. It's cheaper, and lighter than dealing with extensions. In the future when you buy from HK you will not need to do anything. If you buy a battery from another source (I know I won't), you still have left over XT-60's to convert it. These plugs are good, dirt cheap, and A LOT easier solder compared to Deans. (I've never had EC3 so I can't compare to that)


He wont get this type of flight time out of 20C... He could actually cause damage specially when you have an external BEC drawing 5AMP, Servos, gyros etc... that are not factory.

I will not recommend anything lower than 30C... Just my 2c

El Cuajinais
08-27-2010, 01:13 PM
He wont get this type of flight time out of 20C... He could actually cause damage specially when you have an external BEC drawing 5AMP, Servos, gyros etc... that are not factory.

I will not recommend anything lower than 30C... Just my 2c

I will install the same BEC he has tommorrow and will complete my re-build sometime next week so let's see how it goes for me.

Dazhim
08-27-2010, 01:26 PM
El Cuajinais had already suggested these
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9572
http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10432
But I didnt see anybody say anything bout the charger lead
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10266
forget all that adapter plugs and weight you adding to the heli just solder on new leads and b done with it.

dannylightning
08-27-2010, 04:19 PM
damn, never thought about charging the battery and all that stuff.

my stock 20c is getting really hot, the esc just gets warm not instead of almost hot enough to burn you. ok i will get 30c battery.

i like the idea of the addapter tho, wont halve to stretch the battery lead over to the esc hook up any more lol, but i guess i will halve to get some of those charge cables.

i may actually solder the adapted to the original EC3 connection tho. just to make sure it does not come apart on me or any thing.

FR4-Pilot
08-27-2010, 04:37 PM
One way to instantly get 2-3 minutes more flying time from any battery is to replace the stock 10T pinion with the 9T one (mechanically lowering the head speed). That's the good news.

The bad news is you'll probably only be able to do hovering and FFF flight (like I currently do). Inverted stuff will be more difficult as the heli will be sluggish during flips and rolls due to the lower head speed. Who knows - in the proper hands some light 3D might even be possible with the 9T ?

But if all you're interested in is hovering and FFF practice/orientation (or scale type flying) it's an option that works well.

-John

dannylightning
08-27-2010, 05:08 PM
One way to instantly get 2-3 minutes more flying time from any battery is to replace the stock 10T pinion with the 9T one (that is, mechanically lower the head speed). That's the good news.

The bad news is you'll probably only be able to do hovering and FFF flight (like I currently do). Inverted stuff will be more difficult as the heli will be sluggish during flips and rolls due to the lower head speed. Who knows - in the proper hands some light 3D might even be possible with the 9T ?

But if all you're interested in is hovering and FFF practice/orientation (or scale type flying) it's an option that works well.

-John

well i just entered the world of light 3d and will probably kee it at that for a whille, light, flips, loops and rolls, i do this stuff on my SR and hopefully i will soon have enough guts to do it in the 400. i have a extra 9t laying around, not sure if this is a option i would like to explore or not. thanks for the input.

FR4-Pilot
08-27-2010, 06:37 PM
That's cool. I've been flying with the 9T since flight #2 and it really helped me not to crash. I think I'm getting to the point where I'm going to put the 10T back in - it feels like it's time - maybe after flight 100 :thumbup:

-John

dannylightning
08-27-2010, 06:51 PM
That's cool. I've been flying with the 9T since flight #2 and it really helped me not to crash. I think I'm getting to the point where I'm going to put the 10T back in - it feels like it's time - maybe after flight 100 :thumbup:

-John

is the 400 slower with the 9t, as in it wont take off so fast. that might be kind of nice if that is the case.

FR4-Pilot
08-27-2010, 07:43 PM
It can pop right up if you punch it. I really only flew the B400 once with the 10T and that was pretty much right out of the box. Then I went and watched all of the vids and re-did the setups and decided to put the 9T in to help me out a bit. It goes pretty fast now - I can only imagine what it'll be like with the 10T or 11T in it! I look forward to being able to compare the 9T and the 10T when I switch over.

Currently I fly my 2200 packs for 6 minutes then land. I end up putting around 1100-1200 back in - that's only 50% or so, so they should last a pretty long time.

-John

Woody_99
08-28-2010, 07:04 AM
I think these are the adapters from XT60 to EC3 that you need.
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10259

and these batteries will work perfectly for you:
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8934

These work fine as well, just a little lower C rating. These fit better in the stock canopy.
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8932

I have a similar setup as you on the blade with upgraded servos, gyro and a BEC.
The only thing I haven't done is use the adapter from xt60 to ec3. I've been changing the battery connectors to ec3, but I am seriously considering using some of these adapters instead.

The batteries above will work great for you. Fly for 6 to 6:30. They may come back warm, but never hot (at least for my set up).
I think you will be pleased with either of those batteries.

:thumbup:

dannylightning
08-28-2010, 08:53 AM
what about these,

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11911&Product_Name=Turnigy_nano-tech_2200mah_3S_25~50C_Lipo_Pack

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11951&Product_Name=Turnigy_nano-tech_2200mah_3S_45~90C_Lipo_Pack

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11944&Product_Name=Turnigy_nano-tech_2200mah_3S_35~70C_Lipo_Pack

they claim these have a much longer life span than a normal lipo.

Woody_99
08-28-2010, 02:06 PM
what about these,

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11911&Product_Name=Turnigy_nano-tech_2200mah_3S_25~50C_Lipo_Pack

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11951&Product_Name=Turnigy_nano-tech_2200mah_3S_45~90C_Lipo_Pack

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11944&Product_Name=Turnigy_nano-tech_2200mah_3S_35~70C_Lipo_Pack

they claim these have a much longer life span than a normal lipo.


I haven't tried any of those, but it sure seems like they are working out for those folks that have.
What ever battery you use, don't run it down too low. It's hard on them and cuts their life short.
When you are done flying, check the battery voltage. Try to stay around 3.8volt per cell and you should be in good shape.
If you don't have one, get one of the cheap battery checkers that plug into the balance port. They are super easy to use. I found 3 for ~$9 on deal extreme a while back. .
Here's one from Hobby King that will work. There are a bunch more too.

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=7367

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6589

dannylightning
08-28-2010, 02:53 PM
I haven't tried any of those, but it sure seems like they are working out for those folks that have.
What ever battery you use, don't run it down too low. It's hard on them and cuts their life short.
When you are done flying, check the battery voltage. Try to stay around 3.8volt per cell and you should be in good shape.
If you don't have one, get one of the cheap battery checkers that plug into the balance port. They are super easy to use. I found 3 for ~$9 on deal extreme a while back. .
Here's one from Hobby King that will work. There are a bunch more too.

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=7367

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6589

thanks, i should get one, my charger lets me know whats up with my voltage but one for the field would be great.

Luvmyhelis
08-28-2010, 10:55 PM
There is something even better from Boomtown Hobbies! Check this out, I just installed them on 2 of my helis.
http://www.boomtownhobbies.com/Xtreme_Navigation_Lights_w_Battery_Alarm_p/ea-020.htm

and_des
08-29-2010, 11:19 PM
danny since i got the blade400 i only flew 2100/2200mAh 20c packs and with the set up i have now the 20c packs don`t cut it anymore they get hot and puff so i have to restric my flight time to 3-4minutes, probably to close to the max discharge C rating and those lipo`s have a lot of flight time on, all that doing some sport flying loop, roll, flip, ff,fff, etc. i recently got some TP 2250 30c packs i`m still breaking them but wow what a differece afther 5min in the air the pack is still cool and my head speed does not change like it use to do on hard maneuver.

Luvmyhelis
08-29-2010, 11:49 PM
This is kind of the general story of mildly ugraded B400s. The stock battery and 20c just cannot handle the needed power that the new digital components demand along with the engine being ran beyond its capabilities by guys routinely now outflying the helis origional design specs. At this stage upgrading to a higher 30 or even 40c operating system is just common sense. Now throw a scorp motor on top of it or another 4200 stretching its legs and this 30 or 40 c would just be normal and would not function well at all with the supplied 20c that would starve it to death.

pril250
08-30-2010, 12:09 AM
To preserve your batteries always get the highest 'C' rating you can.

A 2200mah @20C can discharge 44A but if you apply the 80% rule then 2200X0.8=1760 and 20CX0.8=16 so the safe discharge will end up as only 28A. If you used a 30C then (2200X0.8)X(30X0.8)=42A constant discharge.

A higher C rating will help preserve your batteries to run for longer and cooler and prevent puffing up thus permanent damage to cells.

Balanced charging at no higher than 1C once the battery has cool down goes without saying of course.

Edit: Easy formula: Ah X C X 0.64 = Safe Discharge Current

doskraut
02-25-2011, 01:34 PM
I am looking for replacement battery's for my blade 120sr.something great for flight time and hopefully with out a mod.my E-flight's i just bought "E-flight 5 for $18"are crap,if a mod is need then give links.I need to know whats better so give me so advice.also i bought the same 5 for $18 for my msr and same problem so i ordered some thunder power battery's.

dannylightning
02-25-2011, 02:01 PM
I am looking for replacement battery's for my blade 120sr.something great for flight time and hopefully with out a mod.my E-flight's i just bought "E-flight 5 for $18"are crap,if a mod is need then give links.I need to know whats better so give me so advice.also i bought the same 5 for $18 for my msr and same problem so i ordered some thunder power battery's.

i think you should ask this question in the SR120 section. this is the blade 400 section..

thatdude596
02-25-2011, 03:55 PM
i have no problem with the stockers. get 4-6 minutes of time. i treat mine horrible, run them til the bird falls to the floor. maybe im lucky, no thats not it either. you got yours from the barn ?
did you charge them first?