A transmitter (19; 36) built to drive an RFID antenna (20) of the transmitter (19; 36) with an antenna signal (21) with a substantial sinusoidal current/voltage and a carrier frequency in the RFID frequency range of 100kHz to 100MHz, which transmitter (19;...

A system (11) of a battery stack (12) and a charger device (13) to charge the battery stack (12) with active balancing of battery cells (3), which battery stack (12) comprises:a series of battery cells (3) with at least a first battery cell and a second ba...