What does "20C" on battery stand for?
There is a Dymond Modelsport battery on which the label reads:
Receiver battery LIFE
What does that "20C" mean?
Also: What does the word "LIFE" stand for?
So if your battery is a 1000 mAh pack you can discharge that at 20 amps safely.
Take them with a grain of salt - many times it is pure marketing. ;)
These are normally used for receiver packs - not for power systems (in 2s at least).
In larger voltages they can be used for flight packs however. They come in two types - flat packs, similar to LiPoly packs and "round" cells. The round cells are in fact used in many hybrid cars. They are very capable, offer 1000 charge, discharge cycles and can be charged at very quickly.
And, some more info on that confounded "C" terminology.
"C" and what it is
Problem with some of those batteries rated at "60C" or higher, if you actually fly a full flight while running your battery at 60C, you've got one minute of flight time before your battery is completely discharged. And, how knows, how hot it got.
IMHO, 20C for a LiFe battery is a bit optimistic. More reasonable to run at a maximum of 10C or 20 Amps for your 2000 Mah battery. That is plenty enough current capability to run even a giant scale model. But, giant scale models require much larger capacity cells, along with dual batteries for reliability.
That said, for me anyhow, LiFe receivers work very well as receiver power. Their voltage discharge curve is virtually identical to a quality 5 cell Nickel Hydride battery pack. When you get to giant scale models where the peak servo currents can hit over 10 Amps, LiFe batteries far outperform a five cell "AA" type Nih battery pack. I've got two cell 2300 Mah A123 battery packs in my two giant scale models for receiver backup power.
LiFe's don't work well as electric motor power though. They simply can't handle the higher currents. For electric power, go to the similar chemistry A123 cells, or LiPos.
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