2 Batteries?

[dxl007]

Any one tried this?

http://www.lightningpower.com/LP_C9022_p/lp-c9022.htm

[LockMD]

Any one tried this?

http://www.lightningpower.com/LP_C9022_p/lp-c9022.htm


I use that on my 600 2 batts in series.........I think if you tried that on the 400 you would fry something as the voltage doubles 22.2V

[dxl007]

I use that on my 600 2 batts in series.........I think if you tried that on the 400 you would fry something as the voltage doubles 22.2V

What about Parallel? Would that work?

[LockMD]

What about Parallel? Would that work?


that would double the mah hours for longer flights but 1) I dont think it would handle the weight and 2) where would you put a 2nd battery.

[dxl007]

I was thinking of rigging something to hold the 2nd batttery under the Heli to keep it balanced. If it would work 1. it would be more stable due to the weight, and 2. you could run 2 times as long....

[LockMD]

I was thinking of rigging something to hold the 2nd batttery under the Heli to keep it balanced. If it would work 1. it would be more stable due to the weight, and 2. you could run 2 times as long....



In theory twice as long but with the extra weight prob more like 1.25-1.5 longer, not sure that would be worth it, then you're killing 2 batts at the same time and now have double the charge time. (like my 600 :()

[eugenefelisco]

In theory twice as long but with the extra weight prob more like 1.25-1.5 longer, not sure that would be worth it, then you're killing 2 batts at the same time and now have double the charge time. (like my 600 :()

You are definitely right plus the motor and esc heat your doooom. You will fry the electronics with too much mah. Don't do it its not worth the risk.

[dxl007]

But I've seen 3 cell batteries @ 11.1 up to 5000 MAH, so if that would work why not 2 1800 or 2200 MAH?

[joediamond]

You will fry the electronics with too much mah

It's not the mah that will fry things, it's the voltage. You could stick a 3S 4000 mah 11.1v battery into the 400 (hypothetically, as you couldn't actually fit one that big into the 400). You would not fry anything as the voltage is still only 11.1 but you would get a much longer flight time.

[Ti RX-8]

You are definitely right plus the motor and esc heat your doooom. You will fry the electronics with too much mah. Don't do it its not worth the risk.
There's no such thing as "too much mAh," and you won't fry anything. There's an old electronics saying: "You can't push current." What this means is all you are doing is supplying a voltage with your battery(ies). The electronics and motor will pull a certain amount of current from the battery. The amount of current they pull does not change depending on the mAh rating of the battery.

The mAh rating on a battery is a "capacity". It specifies how much current in milli-Amps (mA) can be pulled from it for 1 hour (h). With a 20C battery, you can pull up to 20x that current from the battery, but will only be able to do it for 1/20 hours (3 minutes). Or, you could pull 10x that current from the battery, and it would last 6 minutes.

[LockMD]

But I've seen 3 cell batteries @ 11.1 up to 5000 MAH, so if that would work why not 2 1800 or 2200 MAH?


have you seen them in the B400 - I have 2 5000mah on order (they are for the 600 hopefully will get today) but still them things are gonna be HEAVY - will have no CG unless you somehow put a bunch more weight on the tail.

[SeaComms]

It will not be mah that kills it. The lugging around of the extra weight, and the extra fly time that will no doubt be used will be running the motor and ESC for longer periods with that increased load.

There are already too many ppl out there frying the ESC with standard load and run times, carrying an extra 200 grams of weight for a longer period is asking for trouble for my 2c worth :)

[dxl007]

So how much more does a battery weigh that lets say verse the training gear? I fly with that on as I am still learning.

[LockMD]

So how much more does a battery weigh that lets say verse the training gear? I fly with that on as I am still learning.



well since I stopped dealing drugs, I dont have a gram scale ;)


on the potty scale 2200mah = .5 lbs and 5000mah = 1.0 lbs (they just got here) charging them now.......but dude they are HUGE one will not fit even in the stock position.

[LockMD]

So how much more does a battery weigh that lets say verse the training gear? I fly with that on as I am still learning.


Check out the size.....small is 2200 big is 5000

[dxl007]

Check out the size.....small is 2200 big is 5000


No I get that a 5000 MAH will not fit...lol that thing is huge! No I was thinking 2 batteries (2 X 2200 MAH). One under the cock pit and one under the skids. The e flight battery charged @ 1800 MAH is 160 grams.

[LockMD]

No I get that a 5000 MAH will not fit...lol that thing is huge! No I was thinking 2 batteries (2 X 2200 MAH). One under the cock pit and one under the skids. The e flight battery charged @ 1800 MAH is 160 grams.


Again in theory that will work, but as seacomms pointed out,,,, the extra time + extra weight = burned up esc/motor.........if you go this route I suggest you upgrade them and if you do get it working POST your results......you can be the ginnie pig :YeaBaby: once you prove it right and say "wow I have 20 mins + flight times" you might have some followers.

[joediamond]

If you want to use two batteries it's simple.

1. Fly
2. Land, switch batteries.
3. Fly again.

Repeat as necessary.

JD

[newhelliguy]

LockMD
Are those Zippys. I have them for my trex 600 and I love them.

[Mon_t]

If you want to use two batteries it's simple.

1. Fly
2. Land, switch batteries.
3. Fly again.

Repeat as necessary.

JD
In total agreement here, also gives your brain a chance to rest (reducing risk of brain fade).

[LockMD]

LockMD
Are those Zippys. I have them for my trex 600 and I love them.


Yes - have 4300 zippy - k and those are 5000 zippy h first flight last night I really enjoyed the extra weight. Hobby City is already out of stock but when they get more in I will order 2 more. Agreed, love them too.

[eugenefelisco]

Oh yah I'm wrong its not the mah but the load and the extra weight on the motor and the heat build-up. I remember wayback in the 80's I use to run r/c street cars. I beat the 2 speed os21 by 3 car lengths by my electric r/c I ran 2 racing pack in parallel and the in the finish line burned the motor down. To make the story short its possible.
Maybe you can use a 2 cell high mah wired in parallel. Just my 2 cents.

[LockMD]

Oh yah I'm wrong its not the mah but the load and the extra weight on the motor and the heat build-up. I remember wayback in the 80's I use to run r/c street cars. I beat the 2 speed os21 by 3 car lengths by my electric r/c I ran 2 racing pack in parallel and the in the finish line burned the motor down. To make the story short its possible.
Maybe you can use a 2 cell high mah wired in parallel. Just my 2 cents.


a 2 cell? 7.4V will not be enough power.

[eugenefelisco]

How about a 3 cell TP? Tp's are light right.

[LockMD]

If you want to use two batteries it's simple.

1. Fly
2. Land, switch batteries.
3. Fly again.

Repeat as necessary.

JD


if you want 2 batteries, I'd suggest the same as JoeDiamond did. ;)