What capacity?
Capacity is directly linked to runtime- the higher the capacity (measured in milli-amp hours, or
Mah) the greater your runtime will be. Lipo cells in general are available upto about 5000mah in
capacity, beyond this pairs of cells are used in parallel to increase the Mah, and therefore the
runtime. The only downside is that larger Mah cells are also larger in size, and therefore weight
(they are still only half the weight of Nimh cells it is worth noting however). Typical lipo packs are
sold in 4000,5000,6000 and 8000mah sized packs, with the optional battery hold-downs being
required for the larger sizes. The new Emaxx has more room for lipos compared to the old model,
but aftermarket solutions are readily available to allow larger packs to be fitted to either chassis.
What size?
Since size is linked to capacity, it is worth ensuring that you can actually fit the lipos you wish to
use in your truck. The very simple method of doing this is to just measure the length and width
of the battery trays, and the height available with whatever hold-downs you have available. A
Velcro strap is a simple way to allow taller packs to fit, but you are still limited in regards to
length and width, unless you opt for an aftermarket chassis.
What C rating?
The C rating is also known as the discharge rating. This is a measure of how much current ( in
amps) the battery can output before it will overheat and become damaged. Most lipos have the C
rating listed in their specs, but this doesn’t actually tell you how many amps the lipo can ouput,
there is a very simple sum however:
Mah capacity x C rating / 1000 = output potential.
For example, a 10C 5000mah pack can output 50amps, and a 20C 4000mah pack can produce
80amps. This however is assuming that the C rating on the pack is accurate. If you are in doubt,
there is fool-proof way of determining the C rating, but it requires additional equipment. Using an
Eagletree data logger or similar, you can record the voltage level of a lipo in relation to the
amount of current that is being drawn from it. If the voltage level remains at about 3.0v or
higher per cell at the specified C rate in amps, then it is accurate. If not, then it is over-rated. An
example of this would be a 20C 5000mah pack outputting 100amps and staying at about 3.2v
per cell. The graphs can sometimes be hard to interpret, but if you have the current and voltage
graphs on the same chart, you can easily locate the voltage at any given current output.
One important thing to concider when choosing a pack based on its C rating vs mah capacity is
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