In the last 3 articles, Part 1, 2, and 3 of our battery series,  we have discussed three different kinds of batteries; Li-ion,  Li-po, and Ni-Mh that can be used with FrSky Taranis X9d plus. From the title of this article, you might have understood that this is the continuation of the last article in which I have promised you that we will be discussing Li-fe batteries in the next article.

               So in the 4th part of our Battery series I want to briefly explain the main aspects, pros, and cons of the Li-Fe batteries and compare it with other batteries. The ultimate goal of giving some insights on batteries is to have an idea about batteries in general and to decide which battery you can choose for your FrSky Taranis X9d Plus.

               So you might ask, why not recommend a few batteries that are best suited for the radio rather than going through a brief description of the major batteries that are available in the market. The answer to the question is, RC Hobby is about learning and understanding how things work out in it. If you are not up to learning and understanding the various aspects, not even in general, means that you will not able to enjoy the hobby.

               It will be like being a passenger of an Aeroplane. You will enjoy the ride, But you will never experience what it is to like fly the airplane. In a similar manner, you will be able to enjoy the hobby, but you will not be able to experience it not unless you go deeper into it with a strong desire to learn it. Not the least, But, once we cover the basics on

Batteries, we will be covering some of the popular and good batteries that are suited for FrSky Taranis X9d Plus.


               Li-fe or lithium iron phosphate batteries are also a rechargeable battery that comes under the lithium battery family. It is also similar to the Li-ion battery. So how does it differ from Li-ion? As I said in the last article, Li-ion batteries use lithium cobalt oxide or lithium manganese oxide as the cathode. However Li-fe batteries use lithium iron phosphate as the cathode material.

               Li-fe has a nominal voltage of 3.2v or 3.3v which seems to be low when compared with a Li-po that has a nominal voltage of 3.7v. The charge rate is 1c and the discharge rate varies around 1-25c.  We are taking Li-ion battery as a standard to compare the other batteries to have a better understanding.

               Li-fe battery has low energy density when compared with li-ion. As far as the different batteries we have discussed, Li-ion remains to be the one with the highest energy density. But at the same time, the higher energy density makes it more unstable or dangerous, especially when working with environments that have a higher operating temperature.

               At the same time, the lower energy density (not that low) makes it more stable and safe to use in adverse environmental conditions. They can withstand high temperatures with minimum degradation which makes them extremely useful in high temperatures. For the same reason, they are more stable and will explode or catch fire.

               The great advantage of Li-fe batteries is that it can go through a  great number of discharge-recharge cycles. A typical Li-fe battery has a life cycle of 1000-10000 which makes it highly useful for purposes like Transmitter where you don’t have to regularly change the batteries. At the same time, a typical li-ion battery has only a life cycle of 500-1000 which is 1/10th of the lifecycle of Li-fe batteries.

               As it seems the best option for Transmitters, there are so many Li-fe batteries available for FrSky Taranis X9d Plus. In fact, Li-fe has more shelf life than li-ion and safe. But when weight factor is considered, it weighs more than li-ion battery of the same capacity. Therefore, Li-fe may not be selected for applications where portability is a concern.


  • A higher number of lifecycles
  • Long Shell life
  • Not hazardous, can be easily disposed
  • No thermal runaway and most stable



  • Not lightweight
  • Energy density is low (when compared to li-ion)


               So we have briefly covered the different aspects of Li-fe batteries to have a better understanding of how each battery is suitable for different purposes. Li-fe seems to be a great and suitable option for FrSky Taranis X9d Plus and for the same reason, a wide array of Li-fe batteries are available specifically for radios including x9d plus.

               I hope this article has helped someone to have a better understanding of Li-Fe batteries. We are ending the introduction into Batteries with Part 4, and we will be covering some of the popular and best batteries suited for Frsky Taranis X9d Plus in the upcoming articles. Stay Tuned!