what are the benefits
 

I'm getting down to the point of ordering ny batteries. My question is between a 5s 5000mAh and a 5s 6000mAh pack what does the extra 1000 mAh help me in?

what are the discharge rates?

What brand are they & what are they going in?

Leaning toward PolyQuest 25c. It'll be in a Hyper 7 MGM 16018 speed control and a neu 1512/1Y/F motor

The higher the mAh rating, the longer the car/truck runs.
Also this affects the output of the battery....In other words;
a 5000mAh 25c will yield 125Amps while a 6000mAh 25c will yield 150Amps

If your system draws a lot of amps, its better to go for the higher capacity to give you some reserve. The higher cap batt will also operate at a lower temp than a smaller batt under high amp draw.

MORE POWER!
if the c ratings and car setup are the same, the 6000mah will yield longer runtime and higher out put.
Use this formula to determine out put ( (C * mah) / 1000 )

Just IMO, but you do realize that you are setting up a way overpowered system there, right?

At 2750kv you are spinning the motor at 50,000rpm. The Neu can handle the rpms, no doubt, but that speed will require very high gearing. Even at 12/46 you are still up over 50mph.

And with the battery weight of a 5S 5000mAh (639grams) and 5S 6000mAh (754grams) you are going to have two problems - 1) the car will be way to heavy with 2lbs of batteries that Amp draw will go way up and 2) it will be too heavy on the battery side compared with the motor side.

I would go with 4S for this setup, and I usually add motor plus receiver plus servo (obviously depending on where you mount everything) to calculate the approx. battery weight I am looking for to get a good balance, and then try to stay within 50-100 grams of that weight.

For 1512F that would be about 290g+20g+60g=370g with mounting hardware call it around 400g. I would try to keep you battery below ~500g for good balance.

For a 4S pack that would put you in the range of a 4500-5000 mAh battery. I think going up to 6000 would again be putting a bit much weight on (1/2lb heavier on one side that the other).

Thanks for the in-put I never even thought about the weight, I already have the motor but not the battery and I was re-thinking the 5s to a 4s size. As for the speed control after all I have read I might just wait for the mmm to be re-released. Thanks that was helpful.

Just to give you an idea on weight - I run an XB8EC with a 1515/3D at the moment and have run it with both a 6S 2600mAh pack (410 grams) and a 6S 4450mAh pack (676 grams).

Running the two packs back to back with the same gearing, tires, surface and type of driving for 15 minutes.

The 2600mAh pack took back ~1700mAh when charged.
The 4450mAh pack took closer to ~2250mAh when charged.

Proving that even though, yes, a bigger pack gives you more run time - it is definitely a law of diminishing returns.

^^^ what about the 4450 pack being able to supply higher current, and being able to supply full power to the motor? perhaps the 2600 couldn't supply the amps?

I have a feeling it would be fine. If the battery was not up to the task, it would have got very warm. I run a pair of 2170 3s lipos for 6s in my buggy. Easily get 20mins with a 1500kv motor geared for 40mph.

The buggy draw about 1250 watts peak. At 22.2 volts that's 56 Amps.

The 2600 mAh pack is a 25/50C pack so my peaks are well under the 65A constant rating.