@Barkuti,
I didn’t notice that Efan was a Chinese cell — that does give me some pause. I can get the Efan cells for really cheap on clearance from a store in the US. That said since they are really 3500mAh and not 3750mAh like the wrapper says, that means the bang for buck isn’t what I thought it was. Taking that into account the LG 50T cells are actually a little better (mAh/
.
I was also leaning towards the Efans because they’d be more in line with the capacity of the original battery. Part of me wonders if I went to the 5000mAh LG batteries, then I could be running the robots considerably longer than they were designed for. I fear that could lead to wear problems on gears, motors, etc.
Lastly, I am planning on using one of the 21700 battery holders I mentioned in this thread: 21700 battery tray recommendations
Thanks again for all your input!