Battery selection

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RcHexy1991

Well-Known Member
What would be best battery for a tarot t960 with tarot 5008-340 kv motors? I need to make a hexacopter that can lift 3 kg for 10-15 mins, not high only 15 ft at the highest. I know I need a 6s 22.2 volt lipo, but what mah and C would be best? Again I need it to hover 15 ft at highest for 10-15 mins.
 
QuadKid

QuadKid

Noth'in Like a Flat Top
R

RcHexy1991

Well-Known Member
QuadKid said:
Don't know if you will get the fly time you need take a look at this one.
http://www.ebay.com/itm/22-2V-6S-30C-10000mAh-Lipo-Battery-fr-RC-DJI-S800-Aircraft-Quadcopter-Drone-Quad/291990122149?_trksid=p2045573.c100505.m3226&_trkparms=aid=555019&algo=PL.BANDIT&ao=1&asc=44940&meid=69b9a0ce967a4c0dad1aef756d8cf1ca&pid=100505&rk=1&rkt=1&

Your C Rating is up to you, if you are just going to be hovering 25-40C should be OK, as the C Rating is proportional to Thrust value
Click to expand...
 
R

RcHexy1991

Well-Known Member
So the mAh really isn't that important? It's really the c value that I need to concentrate on for my project?
 
dragger201

dragger201

If it ain't broke, don't fix it??? You kidding?
RcHexy1991 said:
So the mAh really isn't that important? It's really the c value that I need to concentrate on for my project?
Click to expand...
Not quite..................the "C" rating is how much pressure your fuel tank/system can handle safely. The "mah" is how much fuel you got in that tank............so they are both important.....................
 
R

RcHexy1991

Well-Known Member
I see. So between a 10000mah 10c vs a 5300 mAh 25c. What would be a better choice. Both are 6s lipo and both are 22.2 v.
 
dragger201

dragger201

If it ain't broke, don't fix it??? You kidding?
RcHexy1991 said:
I see. So between a 10000mah 10c vs a 5300 mAh 25c. What would be a better choice. Both are 6s lipo and both are 22.2 v.
Click to expand...
Hey Hexy........I run some numbers thru eCalc.................based on this I think "Quadkid" hit the nail on the head. With a 5000mah-25/35c battery your flight time drops to 15.1 minutes. a 10000mah-15/25c pretty much mimics the data below.

Important Note:
Before flight recheck your max. current! If your Current, el. Power or RPM are over the manufacturers
limits your motor, controller and/or battery may take damage! Verify before flight by measurment! Also your results will vary from this worksheet. It's been very accurate for working on my S500, but there have been some differences.........

tarot 960 a.jpg
tarot 960b.jpg
tarot 960c.jpg
tarot 960d.jpg
 
R

RcHexy1991

Well-Known Member
dragger201 said:
Hey Hexy........I run some numbers thru eCalc.................based on this I think "Quadkid" hit the nail on the head. With a 5000mah-25/35c battery your flight time drops to 15.1 minutes. a 10000mah-15/25c pretty much mimics the data below.

Important Note:
Before flight recheck your max. current! If your Current, el. Power or RPM are over the manufacturers
limits your motor, controller and/or battery may take damage! Verify before flight by measurment! Also your results will vary from this worksheet. It's been very accurate for working on my S500, but there have been some differences.........

View attachment 2884
View attachment 2885
View attachment 2886
View attachment 2887
Click to expand...

OMG thank you so much!! That was a great help! thank you for those calculations. Could you send me the website that you used? Again thank you so much I have been stressing over this project!
 
yay

yay

Well-Known Member
just woke up, still blurry here so excuse easy question before i melt something -

battery C rating = ceiling on instantaneously available power
battery S rating = number of battery cells (in series)
battery mAh rating = "size of gas tank"

now forgive me because i'm psychologically scarred about electronics. in other venues, the amps a device can handle is critical - it needs a certain number of amps to run the device, too many amps will fry it.

i've read and reread forrest mimms and other books i own (all written 1960s to 1980s, wish i had some earlier books!) but seriously someone fried my ability to parse electronics pretty much. i still occasionally make things, but i don't think about it well.

what i'm concerned about is if i then go and throw say a 500mAh battery on a device that ships with a 360mAh battery... i'm interested in longer flight time only, not power or speed.

it there a mAh ceiling i should stay below when selecting spare batteries for a 2s 360mAh? (i've seen the device fly on 3s)
 
dragger201

dragger201

If it ain't broke, don't fix it??? You kidding?
yay said:
it needs a certain number of amps to run the device, too many amps will fry it.
Click to expand...
Sorry Yay.........you're getting voltage(pressure) and amperage(volume). It's like a water pipe..........as long as the pipe pressure stays within the pipe's PSI rating........it doesn't matter how much water is behind the valve. Same with electricity.....

I've got an Eachine E010 that comes with a 150mah battery that I routinely run a 260mah battery in........longer flight time.
 
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yay

yay

Well-Known Member
wall warts need a sufficient amperage rating for power :) but i'm okay with being wrong and having no idea, it concurs with thirty years of trying to build things. "circuit bending" i can do... made an untuned audio synth out of three 555s, added a dozen potentiometers to an old analog drum machine, but as soon as i start to think about ideal forms and pure design, its like a couple of sledgehammers across the face. electronics and chemistry. give me math, i'm lovely. but it's like i'm not allowed to play with real things.
 
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