BATTERIES / Lithium ion vs LiFePO4


#1

Because lithium ion batteries have about 300 - 500 recharge duty cycles before degrading, might there be anyone that has tinkered with LiFePO4 batteries, which have a 2000 - 3000 recharge duty cycle?

I currently have an EE looking into changing my WowGo 2s batteries to the LiFePO4 kind.

Anyone? Bueller?


#2

This chart may be of interest. Notice how the DoD (Depth of Discharge) affects the discharge cycles before a lithium ion battery degrades to 85% capacity. UPSHOT: Buy the biggest battery you can, so you will apply less stress to it when used on more frequent short runs.

delme

SOURCE
https://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries


#3

UPDATE
After chatting with a Battery Builder, I will be abandoning the idea of LiFoPO4 batteries. They simply don’t hold enough amps.

Instead, I’m think I’ll be using 18650 q30 batteries, which hold a robust 3 amps each.

More about this as things develop.


#4

I like LiFePO4 because they last a long time. But they are for boards with a shorter range, like commuter boards and shortboards with a tail. Range is capped around 15 miles for a regular weight and size board using LiFePO4 but it is a better battery. Just bigger and heavier per amp*hour.

Popular boards using them are the Metroboard “Shortboard” and the Boosted brand boards.


#5

Great info. Thanks! For the same amount of amps as lithium ion, how much more volume would a LiFePO4 pack need to be?


#6

Not sure but I’d guess 60% more volume and 60% more weight. That’s a back-of-the-envelope-style guess. As someone who’s worn-out batteries that are very expensive to replace, I can say not to underestimate the longer lifespan :slight_smile:

Of course on the longest-range boards you can’t really use LiFePO4 – but on short range boards, it’s not bad if done correctly. Also the voltage is a tad different so where you’d use a 10S li-ion/lipo battery for example, you’d use a 12S LiFePO4 to achieve a similar voltage.


#7

Thanks! I REALLY appreciate your input.

I’ll wait for solid state batteries to become available. With minutes to reach a substantial recharge, one only needs enough battery capacity to reach the next fast food restaurant or Starbucks.

What are you thoughts about plugging a 2nd battery of same chemistry and size into the charging port of the first battery?