Hi guys
Dear Robert-Jan
The phone is Panasonic model NO.KX-TC1743B (cordless phone)
it use external adapter the input is 220v 50 Hz
The out put is 9v 350mA so it charges the batteries in hand set but if there is
A failure in power source the phone will not work (receive or send calls)
The base unit will not communicate with hand set
so all I want to do is to make circuit To charge External Battery at the same time to make it work maximum 4 hours
Best regards
Danny