grb121264

I am creating this to discuss batteries


would i be better using one 3-4s 5000mah50-60c or

x2- 5000mah 3s in parallel to make 10000mah 60c


i currently have 2s 5000mah 50 lipo barely even move my redcat volcano with 5900kv racing motor sc1200-bl esc

RustyUs

OK, what do you really mean by "barely even move"? Start the process of ruling out what you know first...I would say to check for binding in the drivetrain, and/or any trim knobs/switches, on your radio, that could have got bumped. Recalibrate the ESC.

RustyUs

If your ESC is the Associated XP SC1200-BL, only use up to a 3S LiPo pack with it.

grb121264

it seems that it is not getting the amps it needs and this battery pack is used and am starting to think this dude ripped me of and this battery doesnt hold well enough for the amp draw even tho its rated 50c

so back to my question would two 5000mah 3s in parallel to make 2x30c=60c" on a custom made y plug, work better than one 3s 60c rated

so basic splitting the draw to two packs to equal 2x5000mah 2x30c

grb121264

i am also haveing some issues getting the pinion and spur gear tried a lot of the stuff suggested on you tube and the pinion and spur gears seem like they are getting hung up on eachother

trax de max

2x30C in parallel still equals 30C, or maybe slightly over. Capacity changes or voltage changes, discharge rates never change.

grb121264

id like to know where your information come from because you sound like an idiot. if you take say two battery cells say 3.7v connect them in parallel then its capacity doubles and voltage says the same and if each one can draw 20A then 40a can be drawn from them, know take the two cells and hook them in series and the voltage would double but capacity and amps drawn would be the same

grb121264

well dummy

trax de max

yes if you read i said capacity changes or voltages changes, maybe i should of made it more simpler and said capacity changes with parallel and voltage changes with series and drawn you a simple picture with big letters making the drawing very simple to understand.
But C rates do not change.
Unless it does change and you would like to explain how and why it changes, as i'm a dummy and don't understand..

RustyUs

I would like to think that 5900kv motor would get your Volcano up and moving pretty good. I know not all motors are created equal, but my Castle Creations 5700kv pushes along my buggy at crazy, stupid speeds...using 2S LiPo packs. If a reliable 3S pack doesn't do much for your Volcano, in the form of speed, I would start the process of elimination on your components. If that used 2S battery is the only one you have, start with a new battery or borrow one if possible.

grb121264

i did order a 2s 30c 6200mah lipo and im changing out the pinion gear to a 20t from a 17t its got to much wheel spin.

right now i borrowed the 35a 3.7v 18650 high drains from a few custom spot lights i have 8.4v at 5000mah 70a peek draw they voltage drop a little but got some testing out of them

also waitng for parts wrecked it at like 35 mph broke the right lower front arm

grb121264

ist the same reason that many electronis you see them use series and parallel at the same time not just for capacity increase
as each battery set added in parallel can be drawn to its amperage limit or also known as current "c" rating

radfordc

My Feedback: (14)

A 30C 5000mah battery can "theoretically" deliver 150 amps. It doesn't change if you put two of them in parallel. Each pack can still can only deliver 30c...but because the parallel packs now have a total capacity of 10,000 mah they can deliver 300 amps.

trax de max

Exactly, but grb if you think this is wrong and C numbers change, why the need to figure out your own question.
C rating is from the cell not pack though. It's relatively fixed number that only changes with internal resistance, not with any sort of configuration.
30C+30C in series = 30C because each cell can only discharge 30C.
30C+30C in parallel = 30C because each cell can only discharge 30C
Can you explain why you are thinking it's different and you might get more detailed help.

grb121264

first off i never said they literally change but 2x 30c does in fact equal 60c that can be pulled

radfordc

My Feedback: (14)

No, that is wrong.

If you put two packs in parallel you double the total capacity.... 2 x 5000 mah = 10,000 mah. Now, if you take your 10,000 mah battery it has a C rating of 30, not 60. You can only draw 300 amps, not 600 amps.

If you put two packs in series you double the total voltage and the capacity stays the same. Put two 12v 5000mah packs together and you have a 24v 5000 mah pack that is still only good for 30C. You can only draw 150 amps.

grb121264

oviously you no not what you think any time that batteries are hooked up in parallel not only does the capacity increase but if the the pack is done right each set in parallel will have a equal load aka amps being drawn per set so if each set can safetly supply 30 amps and your load is 30amps it will draw 15A from each set and can safetly draw a load up to 60amps


there is a direct relation ship between c rating and amps as the "C" stands for current

radfordc

My Feedback: (14)

Actually "C" stands for capacity....not current: https://www.commonsenserc.com/page.p...explained.html

If a battery is rated at 30C there is no way that it can become a "60C" battery. Apparently this is difficult for you to understand, but throwing back insults at those who are trying to help won't make it any easier.

trax de max

Radfordc i just find him/her funny. What it's like to be young again.
But the C number is better known as the multiplier.

radfordc

My Feedback: (14)

I guess we all went through the "young and dumb" phase. Someone said, " life is hard....it's harder when you're stupid ".

grb121264

all of you are dumb when i place two 30c packs in parallel im now considering it to be one pack with the same amperage out as a 60c

and your wrong C does in fact stand for current

grb121264

also im probably ten times smarter than all of you i am a well accomplished it tech

grb121264

lesson 1

capacity in dc is measured by mah or ah

trax de max

you are nine times more smarter than me. Yet again your math is so wrong.

Capacity is what a rechargeable battery can store.


C is not current. You should phone Georg Ohm and tell him his law is wrong, if he doesn't answer phone nasa.http://www.grc.nasa.gov/WWW/k-12/airplane/ohms.html

radfordc

My Feedback: (14)

Hey, don't you realize you're talking to an "IT Tech"!