Dr0ne_n00b
lvl.4
Flight distance : 8060348 ft
Australia
Offline
|
Pashi Posted at 4-4 00:00
I using tons of 18650 and never discharge them. They're all ok. Some of my batteries with 18650 inside (like Sony NP-F) are more than 5-8 years old and still ok. 18650 is best choice for drone, shame that we can't just use 18650 instead of expensive DJI batteries. BTW, Tesla using 18650s too. I'm very tired of LiPo. I'm very tired to trash swollen batteries - from Phantom 2 to Spark... Thanks for 18650, we can even repack it with new banks if something goes wrong.
This post is wrong on so many levels, I'm not even sure where to begin.
18650's are not as good at current discharge as LiPos, that why they arent used generally for drones.
When a cell fails in a drill, it doesnt fall out of the sky, unlike a drone. If a torch shines a little less brighter, most people are happy to wear that consequence for having it always available and ready to operate, drones becomes a little more complex since the device is essentially fighting gravity to operate.
18650s do lose capacity at an accelerated rate when left fully charged, its right there in Samsung's 25R data sheet.
If you try to re-cell one of DJI's batteries and the BMS loses power entirely, the chip will cease to function and the battery becomes a paperweight. People have tried with higher capacity cells and found out the hard way.
Only reason I can think they dont self-discharge is to cut down on weight and cost, self-discharge requires components (banks of resistors) to absorb the energy. Of course you can always just leave the fully charged, it just means shortened life and you having to go out and buy new batteries sooner than others.
Oh and its not "40%", its nominal voltage as per spec sheet, approx 3.7v/cell is where you want to be. The percentage figure can vary from manufacturer to manufacturer or vendor to vendor. |
|