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Blade CX2 › Battery Upgrade
03-08-2008 08:45 PM  10 years agoPost 1
StevenT

rrVeteran

Dallas, GA USA

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Whats is the recommended battery upgrade for the CX2? Also what's more important, the Mah or C discharge rate?

Thanks,

Steven

Shhh, don't tell the wife.

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03-08-2008 11:57 PM  10 years agoPost 2
Gyronut

rrProfessor

Martinsville In.

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I use the Mega 15C 850's from HeliDirect.

Good batts. I have 6 of them and have had no puffing issues.

Get a good solid 9 min of flight time.

Rick

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03-09-2008 01:21 AM  10 years agoPost 3
jltarter

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GA, USA

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I use the DN Power 850mAh 15C LiPo's and have not had any problems...

"Insanity: doing the same thing over and over again and expecting different results."

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03-09-2008 03:33 AM  10 years agoPost 4
Gyronut

rrProfessor

Martinsville In.

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I bought some DN's last year at the toledo show and only got perhaps 75 cycles out of them before they puffed.

I'm afraid the C rating was not as advertised IMO.

Rick

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03-09-2008 04:03 AM  10 years agoPost 5
StevenT

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Dallas, GA USA

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I was looking a at 800 mah with a 20C discharge rate. I've done some searching and I think the mah has to do with charge capacity and the C has to do with actual power output. So am I correct if I buy a battery with the highest C the more power it puts to the motors? I'm more interested in power than flight time.

Steven

PS. What is puffing?

Shhh, don't tell the wife.

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03-09-2008 04:12 AM  10 years agoPost 6
MMike

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Holland,Mi-USA

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Is your CX able to stay in the air?

With a fixed pitch heli, increasing the headspeed will only make it rise.

Different ball game from collective pitch.

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03-09-2008 04:13 AM  10 years agoPost 7
MMike

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Holland,Mi-USA

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Puffing is when a battery swells.

That's bad.

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03-09-2008 10:49 AM  10 years agoPost 8
StevenT

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Dallas, GA USA

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MMike,

Yeah the CX2 stays in the air, when I fly like I'm supposed to, but I like to be as aggressive with it as possible. My current battery can't keep it in the air when I'm flying outside. I've used an upgraded battery before and the difference is amazing. I just wanted opinions, because I want to by the best battery possible for the type of flying I like to do. And thanks for the puffing info.

Steven

Shhh, don't tell the wife.

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03-09-2008 11:58 AM  10 years agoPost 9
MMike

rrElite Veteran

Holland,Mi-USA

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Your battery might be tired.

How many flights on it.

Has it ever been over-discharged.

I use 10C 800 MAH Common sense on my CX and EP100.

They work great!

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03-09-2008 03:44 PM  10 years agoPost 10
BOB WHO?

rrKey Veteran

Downey, Ca.

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You have to pay attention to the temperature of both motors on a cx. This little heli is not designed to fly 'aggressively'. The brushed motors, although not expensive to replace, like a rest between flights and the stock lipo battery gives you about the right air time. Learn all orientations with this helicopter. That is probably where your effort should be put into a CX2. It has more value IMO as a trainer than anything else. Unless you upgrade the heck out of this thing, like getting longer shafts-special blade grips-etc., you can't fly aggressively anyway or the blades collide in mid-air. And if you upgrade you can dump hundreds into it and it's still a Blade cx. Get a belt driven 300-400 size next like a Honey Bee King 2 or Blade 400. Hope you don't mind my offering an unsolicited opinion, but I've 'been there done that'.

Bob

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03-09-2008 10:57 PM  10 years agoPost 11
jltarter

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GA, USA

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I beleive the guy already has a b400 as well as the cx2. He justs wants to get more air time with the cx2.

"Insanity: doing the same thing over and over again and expecting different results."

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03-10-2008 12:41 AM  10 years agoPost 12
MMike

rrElite Veteran

Holland,Mi-USA

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[quote]I'm more interested in power than flight time.

Bob is right.

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03-10-2008 02:44 AM  10 years agoPost 13
StevenT

rrVeteran

Dallas, GA USA

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Bob,
Yeah, I got a B400, but I don't want more flight time with the CX2, just MORE POWER. The higher blade speed lets me fly faster and more aggressively. So what am I looking for, more Mah or more C?
My CX2 is heavily upgraded and has handled the aggressive flight fine with the upgraded battery I borrowed.
You might wonder why I don't just buy the same battery upgrade that I tried; well it's a valid question and I might do that in the end. I just want the best battery I can buy. Again the one with the most power.
I love my CX2 as much as my B400. I think it's because I'm not scared to crash it at full speed. By the way, I definitely don't mind the opinions. That’s why we're all here.

MMike,

My current battery has been over-discharged and only allows 3-4 mins of hover time before it is nearly dead. I know that's a problem, but a new stock battery still doesn't out perform one of the upgrades.

Steven

Shhh, don't tell the wife.

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03-10-2008 02:38 PM  10 years agoPost 14
MEDICGRAY

rrNovice

Westerly, RI

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C vs mA
Stock Blade CX battery is 800mA at 9C. max discharge rate 7.2amps.
Any battery with either more mA or C will theoretically give you better power because current is related to capacity. But for a CX2 with fixed pitch and brush motors you really need to watch the weight if you want more power. You could go with a 1000mA 20C lipo, but the increased weight will eat the added power and burn your motors out faster. If your not really concerned with flight time stick with the stock mA but go with a higher C rated battery, and shave weight where you can.
Battery INFO:
How fast a battery can discharge is it's maximum current capacity. Current is generally rated in C's for the battery. C is how long it takes to discharge the battery in fractions of an hour. For instance 1 C discharges the battery in 1/1 hours or 1 hour. 2 C discharges the battery in ½ or half an hour. All RC batteries are rated in milli Amp hours. If a battery is rated at 2000 mAh and you discharge it at 2000mA (or 2 amps, 1 amp = 1000mA) it will be completely discharged in one hour. The C rating of the battery is thus based on its capacity. A 2000mAh cell discharged a 2 amps is being discharged at 1C (2000mA x 1), a 2000mAh cell discharged at 6 amps is being discharged at 3C( 2000mA x 3).
All batteries have limitations on how fast they can discharge. Because of this many LiPoly batteries are put in parallel to increase the current capacity of the battery pack. When 2 batteries are wired positive to positive and negative to negative they become like one battery with double the capacity. If you have 2 2000mAh cells and you wire them in parallel then the result is the same as 1 4000mAh cell. This 4000mAh cell has the same C rating as the original 2000mAh cells did. Thus if the 2000mAh cells could discharge at a maximum of 5C, or 10 amps then the new 4000mAh cell can also discharge at 5C or (4000mA x 5) 20 amps. This method of battery pack building allows us to use LiPoly batteries at higher currents than single cells could produce.
The naming convention that allows you to decipher how many cells are in parallel and how many are in series is the XSXP method. The number in front of the S represents the number of series cells in the pack so 3S means it's a 3 cell pack. The number in front of P means the number of cells in parallel. So a 3S4P pack of 2100mAh cells has a total of 12 cells inside. It will have the voltage of any other 3S pack since the number of cells in series determines the voltage. It will have the current handling of 4 times the maximum C rating of the 12 individual cells. So say our 3S4P pack had a maximum discharge of 6C. That means that it has a nominal voltage of 10.8 volts (3x3.6) and a maximum discharge rate of 50.4 amps (2100mAh x 6Cx4P ).

.

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03-10-2008 07:42 PM  10 years agoPost 15
StevenT

rrVeteran

Dallas, GA USA

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Medicgray,

Thanks for the information. Of the two batteries I've found, one was 850 mah and 15C and the other was 800 mah and 20C. Guess I'll go with the 20C.

Steven

Shhh, don't tell the wife.

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