Author Topic: Battery Suggestions  (Read 1063 times)

Offline STiXzoOR

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Battery Suggestions
« on: March 12, 2018, 01:01:13 PM »
so i gathered all the components that i need but i'm still debating on which battery to choose. I know the battery should be able to provide with ease the amperage that motors draw but there are so many batteries out there with different discharge rates and mAhs. As far as i know i should check how many amps do the motors draw, choose the appropriate esc which can handle the demands and then check which battery suits my needs. Here in the forums, most of the build diaries use the Multistar 3S 3000mAh 10C battery but i did some digging and that battery can only provide 30amps. Correct my if i am wrong. Can i go higher than 3000mAh or will it be to big to fit in the mavic. So my motors draw around 20A in full power each so i will need at least 80A to be able to fly. Here are my motors esc as well as the battery that i think it's a good choice:

Emax XA2212 1400KV
Hobbywing 4 IN 1 ESC XRotor Micro 40A
Limskey Drone 3S 11.1v 3000mah Lipo Battery 30c
« Last Edit: March 12, 2018, 01:03:12 PM by STiXzoOR »

Offline laazarus

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Re: Battery Suggestions
« Reply #1 on: March 15, 2018, 10:37:12 AM »
This is only a small copter and due to the folding arms it's not really suited to aerobatics and racing. if you manage to pull 80A they will probably need to invent a new branch of physics to explain it. My hex doesn't pull that and its probably over 3kg and eats batteries.
The multistar 3000mAh is about the biggest that will fit with out printing at greater than 100% scale.

Offline STiXzoOR

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Re: Battery Suggestions
« Reply #2 on: March 15, 2018, 11:09:09 AM »
This is only a small copter and due to the folding arms it's not really suited to aerobatics and racing. if you manage to pull 80A they will probably need to invent a new branch of physics to explain it. My hex doesn't pull that and its probably over 3kg and eats batteries.
The multistar 3000mAh is about the biggest that will fit with out printing at greater than 100% scale.

So let me get this. I should only need a battery that can produce at least 30A like the multistar since my motors draw 20A each right? When i said i will need 80A i was counting 4 motors x 20A = 80A. Yeah i know it's the smallest but i can't find it anywhere, besides hobbyking, with low shipping cost. Hobbyking charges me 70 for my country. One question though, wouldn't higher discharge rate give me more flight time than the 10C?
« Last Edit: March 15, 2018, 01:20:31 PM by STiXzoOR »

Offline laazarus

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Re: Battery Suggestions
« Reply #3 on: March 18, 2018, 01:00:47 PM »
right last question first and I may have to come back to the others as I'm just on my way out. The C rating is how much current you can safely pull out of the battery it has nothing to do with the capacity. you will generally find that if two packs have the same capacity the pack with the higher C rating will be physicaly larger. I'll add some example pics later.

updated:
ok I've added the battery comparison pic. the multistar is the 3000mAh 10c that fits in the mavic clone, the other is a 2550mAh 40c Zippy Rhino.

And as I have a bit of time I'll try and tackle your other questions. The 20A that is quote as what your motors can pull is the theoretical maximum. To get to that level of draw on this model is going to be near impossible, its going to be at hover below half throttle. even with the throttle wide open there isn't going to be much load on those motors so a 20A draw even if you did manage it punching out from a take off its only going to last for a fraction of a second as the model gathers a bit of momentum.

As for other sources for a pack I don't know. you could try the various Chinese sites its just going to be a case of matching the dimensions to the size of the space in the model body. or if you have a model shop you can visit locally they might be able to help.
« Last Edit: March 19, 2018, 09:27:00 AM by laazarus »

Offline STiXzoOR

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Re: Battery Suggestions
« Reply #4 on: March 19, 2018, 11:22:20 AM »
Damn that's huge compared to multistar. Thanks for the info man you filled the gaps that i had in my head. Actually i managed to find a local store that sells the multistar brand and i went with a 4000mah 10C since it's not so different in size than the 3000mah.

Offline laazarus

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Re: Battery Suggestions
« Reply #5 on: March 19, 2018, 04:34:47 PM »
That 3000 only just fits in. any wider and it wouldn't fit between the front arms, any taller and the lid wouldn't fit. depending how you run the cables to you ESC you could shorten its main power cables and maybe get a few extra mm on the length.