Fast charge just means you charge at Constant Current. Once you reach the CV phase the charger stops. You can do this at literally any current up to whatever the max current for your cells is.
I usually do mine at 1c
The capacity you put in is always higher than the capacity you discharge. This is because your charger is not 100% efficient and there are some losses in the wires, etc. This also happens because your charger will balance the cells which pretty much entails charging the battery and discharging the cells with high voltage through balance leads until all of the cells are at the same level, the charger does not take this into account when giving you the amount of energy you put in. A simple way to see this is by charging not balanced and then balanced and you’ll see the latter takes in more capacity even if they end up at the same voltage
For him its 25 for you its 40. And fast charging really is just cutting off the cv stage. There is no current defined that you should charge at for it to be fast, all companies do it at different rates.
EG Tesla does 1C I believe, Android phones do 2C, Lipos can be done at 5C, liions at 1-2c.
It really depends on the application. The one thing they all have in common when they say fast charge is that they cut off the cv phase
No. You would kill your cells.
25A per vesc is 50A total. Your cells are only rated to 20continuous and you have two in parallel which means 40A total. Your settings are fine, you might be pushing them a little
This is what i was talking about, at first I didnt know it but i think it later on becomes clear that you can get ‘varied’ amount of capacity when discharging.
Discharge rate and temperature influences this, so the cells are not as ‘linear’ as we would like to think
sorry for my math above I thought we were working it out for one motor.
As you say @okami, and I wonder how well a lipo being used under the typical low rate of discharge for its stated ability on a board will compare to a li-ion being pushed further towards it’s discharge limit in capacity and also life cycles.
but can’t you get really close discharge energy to the input energy if you draw at low amperage? the conversion from chemical to electrical energy is probably the most efficient thing on the board possibly
The word “fast”…can mean anything I guess but in my mind a fast charger is one that would charge fast. 1c rate is pretty fast.
