Changes
/* Batteries */
** Current: 20C * 2.2Ah = 44A
** Power: 44A * 11.1V = 488.4W
* S is the number of cellsin series, and is representing the tension (1S=3.7V, 2S=7.4, 3S=11.1V, ...). P is in parallel. Usually LiPo are in series and P=1
* Balancing: Cells need to be a the same charge level so we can avoid overcharging.
** It's a good idea to always use the balance mode to charge a multiple cells battery
