I'm designing a charger system for my lawn mower robot.
The idea that I had is based on a relay. As soon as the robot reaches the charging station, with "Volt Sense" pin it detects a charging voltage, so enables the "enable charge" output. In this way the the relay coil is turned on and so the battery switches from the normal circuitery to the charging one. I didn't put the charging part of the system, but that one is quite easy, since I have a lead acid battery.
The enable charge pin is there also to control the charging of the battery. When it's fully charged, the pin is switched off, so the battery can go back to normal functioning mode.
I will add a current measurement IC, so when the current drop to very low values, the battery is considered charged.
I'm not sure if the following schematic is ok, could you please tell me your opinion? Thanks
EDIT: I added the charge measurement pin.