Need advice on battery use

[Erouz]

Hi guys
As new member still have little issues to understand all terms and navigate parts batteries what I can what I shouldn't.
Got my self this monster

Name	Desert Buggy
Code	DBX-07
size	1:7
Drive	4WD
Wheelbase	419mm
Chassis height	52mm
speed	80km/H
Gear ratio	15：1

2.4 GHZ Super Response 4-Channel Radio（4-AA battery Without ）

150A ESC

Li-po Battery 11.1V 5000mAh 2pcs

Surpass 4282 Brushless Motor 2000KV

25kg servo

And with out much thinking ordered extra two pack of batteries.
Now I understood diffidence between s3 and s4 but few days ago I was thinking is difference in capacity.
Now I know there is difference in voltage.
My question is. In my car there are 2 s2 5000mH connected in chain which make car have 10000mH and 11.2v
can I use new batteries one 14,2v 8000mH or I kill the electronics. If yes can I use 2 which gives 16000mH?

I was looking answer in post but didn't find anything sorry for stupid question.
And sorry for my bad English I'm not native speaker

I think I found answer pleas correct me if I'm wrong.
From table I figure out I can use up to 23 volt is that correct?

 

[WickedFog]

If you wire the batteries in series, your voltage doubles, but the capacity remains at the single pack range. So two 5000mAh 3s batteries will have a nominal voltage of 22.2v, and 5000mAh total capacity, resulting in your motor turning between 40,800 RPM by the time the cells reach 3.4v and 50,400 RPM at full charge of 4.2v per cell. That truck is rated for 6s, so you will be fine with two 3s batteries. But 4s batteries will definitely kill it very quickly.

 

[Erouz]

I think I found answer pleas correct me if I'm wrong.

From table I figure out I can use up to 23 volt is that correct?

If you wire the batteries in series, your voltage doubles, but the capacity remains at the single pack range. So two 5000mAh 3s batteries will have a nominal voltage of 22.2v, and 5000mAh total capacity, resulting in your motor turning between 40,800 RPM by the time the cells reach 3.4v and 50,400 RPM at full charge of 4.2v per cell. That truck is rated for 6s, so you will be fine with two 3s batteries. But 4s batteries will definitely kill it very quickly.

 

[Erouz]

Yes you have 100%
But from what I figured out and you can see on picture they are parallel so in my case it's 2x5000mH out from box and still 11.1v So my question is can I use 14.2v 8000mh one battery or 2 in parallel configuration which gives me 16000mH and I still be on 14.2 but under max rating 23v.

 

[WickedFog]

Yes you have 100%
But from what I figured out and you can see on picture they are parallel so in my case it's 2x5000mH out from box and still 11.1v So my question is can I use 14.2v 8000mh one battery or 2 in parallel configuration which gives me 16000mH and I still be on 14.2 but under max rating 23v.

View attachment 225007

That is series. Not parallel.

 

[Erouz]

That is series. Not parallel.

So is 14.2v ok for use in my case?
That all is new for me so I'm not using right names and cause more misunderstanding.
Sorry

 

[WickedFog]

It says your RC is good up to 6S, which is 25.2v at max charge. So yeah, 14.8v will be fine. But your number is off there. 14.2 is not a LiPo voltage.

LiPo's are labeled by their nominal (medium charge) voltage, which is 3.7v per cell.
So a 2s is labeled as 7.4v (2 × 3.7v)
A 3s is 11.1v (3 × 3.7v)
A 4s is 14.8v (4 × 3.7v)

Standard LiPo's charge to 4.2v per cell. So your 14.2v you mentioned there shows a bit of a misunderstanding about LiPo's.

So a 2s max charge is 8.4v (2 × 4.2v)
A 3s is 12.6v (3 × 4.2v)
A 4s is 16.8v (4 × 4.2v)

What batteries do you actually have for this RC? You've mentioned 2s, 3s, and 4s. You definitely do not want to run dual 4s batteries in it. One would be fine.

You want to consider the RPM your motor will be turning with your batteries. Your motor is a 2000kv. The way you figure that is like this...

2000kv means your motor will turn 2000 RPM per 1v of power.

So for example, on 6s (22.2v nominal, 25.2v maximum charge) you would multiply your motor kv by the voltage. So...
2000 × 22.2 = 44,400 RPM
2000 × 25.2 = 50,400 RPM

50,000 RPM is right there at the maximum of what I would run an RC motor. So on 6s, you'll be pushing that motor to it's limit.

With that, you will want to make sure your motor isn't getting too hot. An infrared temp gun should be in your toolbox in this hobby. Get one, and monitor your motor and ESC temps. You will want to stay below 170°F or 76°C. That is the max I would let my electronics get, but I typically stay below 160°F or 61°C, just in case a bearing starts to wear out, which will raise your temperatures fairly quickly.

If your temperatures run too high, you can lower your electronic temperatures by altering your gearing. A smaller pinion will be easier on your motor, and lower your temperatures, while a larger pinion will do the opposite.

 

[Erouz]

It says your RC is good up to 6S, which is 25.2v at max charge. So yeah, 14.8v will be fine. But your number is off there. 14.2 is not a LiPo voltage.

LiPo's are labeled by their nominal (medium charge) voltage, which is 3.7v per cell.
So a 2s is labeled as 7.4v (2 × 3.7v)
A 3s is 11.1v (3 × 3.7v)
A 4s is 14.8v (4 × 3.7v)

Standard LiPo's charge to 4.2v per cell. So your 14.2v you mentioned there shows a bit of a misunderstanding about LiPo's.

So a 2s max charge is 8.4v (2 × 4.2v)
A 3s is 12.6v (3 × 4.2v)
A 4s is 16.8v (4 × 4.2v)

What batteries do you actually have for this RC? You've mentioned 2s, 3s, and 4s. You definitely do not want to run dual 4s batteries in it. One would be fine.

You want to consider the RPM your motor will be turning with your batteries. Your motor is a 2000kv. The way you figure that is like this...

2000kv means your motor will turn 2000 RPM per 1v of power.

So for example, on 6s (22.2v nominal, 25.2v maximum charge) you would multiply your motor kv by the voltage. So...
2000 × 22.2 = 44,400 RPM
2000 × 25.2 = 50,400 RPM

50,000 RPM is right there at the maximum of what I would run an RC motor. So on 6s, you'll be pushing that motor to it's limit.

With that, you will want to make sure your motor isn't getting too hot. An infrared temp gun should be in your toolbox in this hobby. Get one, and monitor your motor and ESC temps. You will want to stay below 170°F or 76°C. That is the max I would let my electronics get, but I typically stay below 160°F or 61°C, just in case a bearing starts to wear out, which will raise your temperatures fairly quickly.

If your temperatures run too high, you can lower your electronic temperatures by altering your gearing. A smaller pinion will be easier on your motor, and lower your temperatures, while a larger pinion will do the opposite.

First I want thank you for your effort and sharing your knowledge it's helping a lot.

My RC came with installed 2 s3 5000mh. Me being me just hop on and ordered extra 2 batteries with out thinking twice and not only I ordered 2 s4 8000mh but as well with wrong plugs haha no big issues or use adapters or just resolder new right onc.
Battery voltage I give it was just mistake on my side numbers are as mentioned.

Now thanks to you can confidently have fan. One more time thank you for all information.

 

[RustyUs]

Dude, you need to make a "ZD Racing DBX-07 Desert Buggy" thread in the Buggy and Truggy category. I'd be so interested in your thoughts on the pros and cons of that platform.

 

[Erouz]

I will try to do it. Just need little time to figure out things.
Only problem with cons and pros I don't have reference point as it is my first RC