LI-PO BATTERIES. Why Li-po battery is used? Li-Po batteries (short for Lithium Polymer)- light weight have large capacities, meaning they hold lots of.

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Presentation transcript:

LI-PO BATTERIES

Why Li-po battery is used? Li-Po batteries (short for Lithium Polymer)- light weight have large capacities, meaning they hold lots of power in a small package. high discharge rates to power the most demanding electric motors.

VOLTAGE RATING Unlike conventional NiCad battery cells that have a voltage of 1.2 volts per cell, Li-Po battery cells are rated at 3.7 volts per cell. 3.7 volt = 1 cell x 3.7 volts (1S) 7.4 volt battery = 2 cells x 3.7 volts (2S) 11.1 volt battery = 3 cells x 3.7 volts (3S) 14.8 volt battery = 4 cells x 3.7 volts (4S)

CAPACITY Capacity indicates how much power the battery pack can hold and is indicated in milliamp hours (mah). The main thing to get out of this is if you want more flight time; increase the capacity of your battery pack. Unlike voltage, capacity can be changed around to give you more or less flight time.. DISCHARGE RATE Discharge rate is simply how fast a battery can be discharged safely. In the RC Li Po battery world it is called the “C” rating. Battery with a discharge rating of 10C would mean you could theoretically & safely discharge it at a rate 10 times more than the capacity of the pack, a 15C pack = 15 times more, a 20C pack = 20 times more, and so on.

80% RULE A very good rule to follow here is the "80% rule". This simply means that you should never discharge a Li Po pack down past 80% of it's CAPACITY to be safe. For example, if you have a 2200 mAh Li Po pack, you should never draw more than 1760 mAh out of the pack (80% x 2200). 1760*30C FLIGHT TIME= capacity of battery*discharge rating/current drawn by motors and other devices. 8A drain on a 2000mAh battery will give the Flight time of?

CHARGING LIPO BATTERIES If you have a 2 cell (2S) pack you must select 7.4 volts or 2 cells on your charger. If you selected 11.1V (a 3S pack) by mistake and tried to charge your 2S pack, the pack will be destroyed and most likely catch fire.