The battery is one of the basic components of FPV, and it must be carefully selected for optimal FPV performance. Because of the high energy density and high discharge capacity ( high c-rate ) of lithium polymer batteries (LiPo batteries), as well as their light weight, this type of battery is often used to power FPVs.
For voltage, voltage directly affects the RPM of brushless motors, so if your motors / ESC and other electronics support higher voltages, you can use higher voltage batteries to increase the speed of your 4-axis flyer.
- RPM: Motor speed, which indicates the revolutions per minute of the shaft, e.g., if the motor is running at 2000 rpm, it means that its shaft is rotating 2000 revolutions per minute.
- ESC: An electronic speed controller that provides high power, high frequency, high resolution three-phase AC power to the motor in an extremely compact structure and fine speed control over a wide range of motor/propeller speeds, providing all the control needed for flight.
Lithium polymer batteries can operate within a safe voltage range of 3V to 4.2V. When the battery is below 3V, continuous discharge can cause irreversible performance loss or even damage to the battery.
Overcharging above 4.2V is also dangerous and may cause a fire. For the health and stable performance of the battery, it is recommended to stop discharging when it reaches 3.5V, which is measurable using the charger. I Mars III charger for lipo battery health status detection, overcharge protection, storage and other functions can be set with one click, very user-friendly.
Lithium polymer battery packs are usually sold in 1S, 2S, 3S, 4S, 5S or 6S configurations, where the number in front of the "S" represents the number of cells in the pack, and the higher the S number, the more cells there are and the higher the voltage of the unit. The higher voltage allows the motor to rotate at a higher speed (RPM).
Increasing the number of batteries may provide higher capacity and voltage, theoretically extending your flight time, but it will be correspondingly heavier and larger in size, which would in turn affect the aircraft's flight time and agility. Be careful: there is a trade-off between capacity, voltage and weight. For this reason, people tend to choose 4S batteries because they offer a balance between speed and weight.
Of course, you can also choose high voltage batteries, referred to as LiHV, HV stands for "high voltage". They have a higher energy density than standard LiPo batteries and can be charged up to 4.35V per cell. They can free up more capacity, thus giving your device a longer endurance.
Before, you may have heard that high-voltage batteries are less safe than standard ones, but as the technology behind high-voltage batteries has matured and their safety grades have improved over time, you can pick them with no worries.
For other applications, please consult our Grepow brand.