So I bought this “Ebike Battery Pack 24v 30ah Electric Motor Bike Bicycle Lithium Ion“.
It arrived reasonably fast (a month) and made me pretty happy.
So happy that I went straight to Risa and gave it to him to check how is it doing. As you can see on the picture below, Risa ran a continuous discharge test (actually he ran multiple tests) which demonstrated that this battery has only 3.43Ah capacity in comparison to advertised 30Ah.
Richard then first did Balance on battery, and then charged 1A 6S. After checking voltage he sees it drop quickly to 24V. Now he restarted charging at 0.3A, low and slow to get more capacity before it gets destroyed on a 1A discharge cycle to determine new capacity.
And it took another day to get a final result for our “brand new” 6S battery pack.
So final power balance sheet for our “Ebike Battery Pack 24v 30ah Electric Motor Bike Bicycle Lithium Ion with Charger – twisted into 6S” is:
If I’ll go full power – 2x 10A x 24V -> 480W
74Wh/ 480W -> 0.15h ~> 10mins drive.
I suppose the “no full power” option should get us to some 15-20 minutes.
Remember that the cutoff will be set to some specific voltage, and that depending on the current you’re drawing, voltage will sag – so you might only be testing a fraction of the battery *capacity* when drawing too much *current*