Almost all Lithium Polymer batteries you buy today will come with a ‘C’ rating. The ‘C’ in C rating stands for Capacity. The C rating is the maximum, safe, continuous discharge rate of a pack as specified by the manufacturer, so when you see 20C printed on your label, it means it can be discharged at 20 times the pack’s capacity,”continuously”. Capacity is usually measured in mAh and a popular cell size is 2200mAh. Therefore, so by way of example:
2200mAh 20C Cell = 2.2A x 20 = 44A continuous discharge
Along with the continuous discharge rate, some batteries display ‘burst’ discharge rate. This is typically twice the continuous discharge rate. It usually means the battery is capable of allowing twice the current, but only for a few seconds at a time.
Lithium Polymer batteries come partially charged and are significantly more volatile than the alkaline, Ni-Cd or Ni-MH batteries used in RC applications. Here are some guidelines for using Lipo Batteries.
Before the First Charge
Make a visual and physical inspection of the battery. Look for any damaged or loose leads or connectors, broken shrink tubing or other irregularities which may cause a short circuit and eventual fire.
Check for proper polarity of the factory installed leads and connectors. Use a digital voltmeter to ensure that the polarities are correct.
Check the voltage of the battery using a digital voltmeter or the E-flite Power Meter (EFLA110). The voltage of the cells within the battery should be between 3.5V and 3.9V each.
The voltage of a new 2S (7.4V nominal) battery should be between 7.0V and 7.8V
The voltage of a new 3S (11.1V nominal) battery should be between 10.5V and 11.7V
The voltage of a new 4S (14.8V nominal) battery should be between 14.0V and 15.6V
The voltage of a new 5S (18.5V nominal) battery should be between 17.5V and 19.5V
The voltage of a new 6S (22.2V nominal) battery should be between 21.0V and 23.4V
Charging Guidelines and Warnings
RCBatterysupply is Chinese Top 10 professional manufacturer who is specialized in produce high discharged rate Li-Polymer UAV batteries and RC battery R&D. RCBatterysupply batteries are used widely in the Hobby Field, including FPV racing drone, Helicopter/Quadcopter rc batteries, rc toy plane battery and so on.
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