Which LiPo battery?

[Chris.vincent3]

Hi, just bought a traxxas slash and want to get some spare lipo batteries but don't know which ones to get.

What mah? What C? Do I get.

Looking for a long run time without sacrificing performance.

I'm new to all this so any info is appreciated.

Thanks.

[CrashBangWallop]

All depends on how you are going to use the car, bashing or racing ?

The higher the Mah ( milliamp hour ) rating = longer run time

The higher the 'C' rating = how much current ( amps ) the battery will put out.

If you are bashing, lower 'C' numbers like 20 - 35 C will be fine just aim for as much capacity as possible within your budget.

If you are racing, Higher 'C' numbers like 40 - 90 C will be better as the pack will give out more power, but also best to get higher capacity packs.

Some examples of what you might see on a pack :-

2200mah 20C. Low capacity - runtime short. 20C. Lower current output This would be hopefully now be a really cheap pack of Li-po's.

5300mah 40C Over 2x capacity of the 2200's with 2x current output
This would now be a 'middle of the road' pack of Li-po's.

6000mah 90C Not much more capacity than 5300's but still an improvement on runtime but a big jump in 'C' rating.
These would be the 'Bugatti Veyron' of Li-po's and come priced accordingly.

Best to see what your local model shop has first and or the Trade section of Oople as bargains come up most days !

I am not going to say buy from overseas but there are bargains to be had if you look in the right places and are prepared to wait a week or two.

This is just a simple guide and no doubt someone else will write a better explanation.

[VintageRacer]

2200mah 20C. Low capacity - runtime short. 20C. Lower current output This would be hopefully now be a really cheap pack of Li-po's.

5300mah 40C Over 2x capacity of the 2200's with 2x current output
This would now be a 'middle of the road' pack of Li-po's.

This is not strictly correct as the C refers to the capacity of the cells, so a 2200 20C pack can deliver 2.2A x 20 = 44 Amps whereas the 5300 40C can deliver 5.3A x 40 = 212 Amps !

Just to confuse thing:
High capacity cells with a low C rating might actually be able to deliver higher peak currents than a low capacity, high C pack.

However, just because cells can deliver the current, it doesn't mean they will as the current drawn depends on the motor and gearing to a large extent.

[spikey_58]

Very helpfull - thanks

[Chris.vincent3]

It'll be used for both really, thrashing it in open spaces with a mate of mine who's got a few nitro ones. Want somthing that'll out run him :D

Btw I'm running a castle creations brushless system with a 15 tooth pinion and 90 tooth spur gear.