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Home✈️Aircraft🚁Helicoptere-Electric General Discussion › Wiring 2 batteries parallel
12-24-2015 09:28 AM  3 years ago
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DennisH

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Baton Rouge Louisiana USA

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Wiring 2 batteries parallel
If you take 2 6s 6,000 Mah batteries and wire them up parallel, you should have a 12,000 Mah equivalent battery, correct?

My question, I am looking for more flight time. Should I get a 12,000Mah battery, or is it Ok to hook two 6,000Mah batteries parallel?

How much more flight time (minutes) should I expect out of a 12,000Mah battery?

I see they have 22.2v, 6s, 15,000Mah batteries also (single battery).

It also seems if you have "2" 22.2v, 6s 15,000Mah batteries hook up parallel, you should have a 30,000Mah battery. Am I off base with these thoughts. My helo will hold and balance with 2 of these batteries.

Just looking at pro's and con's trying to gain more flight time.

Your thoughts and suggestions will be appreciated. I know I am probably off the charts with some of my thoughts, but I would like to know the answers.

Dennis

PS: I searched several areas, but did not really come up with the answer I am looking for. I know different helo's will have a different outcome. I am flying a T-Rex 600 with 6,000 Mah battery that gives me about 7 minutes flying time. My goal: I would like to have around 12 to 15 minutes flying time.

Thanks in advance for your help,
Dennis
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12-24-2015 09:41 AM  3 years ago
pctomlin

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Texas

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Your thought process is correct on parallel batteries and capacity. As far as flight goes, yes you will get longer time in the air but not necessarily double. For the purpose of simplicity the additional weight will come at a cost to performance and efficiency.

There are so many parameters to increasing flight time. Overall weight, blade length, headspeed, battery capacity, voltage, amps drawn, efficiency of the components, how you fly just to name a few.
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12-24-2015 02:48 PM  3 years ago
DennisH

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Baton Rouge Louisiana USA

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Thanks pctomlin,

That's the information I am looking for. I have two 5,000Mah batteries wired parallel now and get about 10 to 12 minutes fling time. I just fly around and don't do any 3D stunts nor do I put much of a strain on the motor.

I am trying to get about 15 to 18 minutes flying time and I am trying to make sure the investment in two 8,000Mah, 10,000Mah or 15,000Mah batteries are worth the investment. Another option is to go with "one" 18,000Mah battery. Is it best to go with one, or Paralleling two would work as good? (Example: Two 8,000Mah batteries = 16,000Mah)

Hopefully someone out there has tried it. I know the added weight of the bigger batteries will require more power out of the batteries.

I do understand your reply and appreciate it.

Dennis
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12-24-2015 04:59 PM  3 years ago
rcflyerheli

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Granbury, TX USA

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A couple other things. You will pay a slight weight penalty for running 2 packs in parallel due to the wiring and each having their own external shrink wrap.

However, from a cost standpoint, I found I could get two 2200mah 3s packs that cost less than one 4400 sized pack. I don't know about how that holds going to the larger packs, though.
Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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12-24-2015 05:02 PM  3 years ago
artimus

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Buckley WA

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Will your charger charge both batteries at the same time? If not You will cut down how many flights you get in a day.....spending more time charging than flying. Fly more charge less....if you want to fly that long get a gasser fly all day for $3.00 of fuel.Fly Hard......Team Viagra
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12-25-2015 10:17 AM  3 years ago
DennisH

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Baton Rouge Louisiana USA

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artimus, YES, my charger will balance charge both batteries (independently) at the same time.

rcflyerheli, This is why I am asking the question. I can purchase two 8,000Mah batteries for less money than one 16,000Mah battery.

As stated,my helo was built to handle 2 batteries wired parallel.

As far as efficiency, I don't know if 2 batteries wired parallel (8,000Mah) would be as efficient as one battery (16,000Mah). I have heard different opinions on this.

My helo will handle the larger size (16,000Mah, app 3" wide) battery, but I will admit, having two 8,000Mah batteries (app 2" wide) would be a lot easier to mount in my helo as this is the way I built it. I can easily stack two 8,000Mah with NO problem.

I know I won't double my flying time, but if I can increase it 50% or so, I would go ahead and make the change.

I am currently running two 6,000Mah batteries (parallel) stacked and sometimes I get around 12 minutes flying time. My goal is to reach 15 to 18 minutes flying time. I don't do any 3D flying, but the helo does weigh a little more requiring more output from the batteries.

I know this is a little anal, but it's our hobby and I am trying to have the most fun I can.

Thanks for your opinions and help,

MERRY CHRISTMAS TO ALL,
DENNIS
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12-25-2015 12:12 PM  3 years ago
doorman

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Sherwood, Arkansas

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Two x 8k
Your talking about quite a bit of weight.., but if your already doing 2x6k, it probably won't add that much more..
You might consider longer blades if they will fit, or maybe a set of wide cord asymmetrical blades along with a lower hs to help counter the added weight of the 8k's
Just a thought!!!!
Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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12-25-2015 03:42 PM  3 years ago
KevinB

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Earth

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What doorman said.
On my 690sx, I get 5 to 6 minutes flying harder at 2050 head speed with two 5000mah packs in series. (12s) With just one 5000mah pack flying as gently as possible, I can stretch the flight time to 18 to 20 minutes. (800-1000 head speed)

KevinB
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12-26-2015 12:04 PM  3 years ago
DennisH

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Baton Rouge Louisiana USA

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Stan, I have already change the main blades. They really made a "big" difference.

Still thinking and I appreciate the return comments. Keep them coming.

I hope everyone had a great Christmas and are looking forward to a Happy Prosperous New Year.

Dennis
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12-26-2015 03:42 PM  3 years ago
doorman

rrProfessor

Sherwood, Arkansas

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More Info
Hi Dennis,
I am thinking that we are going to need some info on your set up to be able to give you more ideas..
Esc
Kv
Gear ratio
Target HS
AUW
Throttle curves

Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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12-27-2015 12:25 AM  3 years ago
DennisH

rrApprentice

Baton Rouge Louisiana USA

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Doorman,

Let me see if I can quickly gather this information.

Thanks, Dennis
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