hi
i have a robot work with two batteries one for the microcontroller and low consuming power circuits (2x 3.7v 18650 battery in series with total 7.4v )
and one for the motor and power sucker stuff (6v/4ah sealed lead acid battery)
i’ve wired it as shows in attachmed photo
i used toggel switch to switch between operation mode and charging mode
my problem is the 7.4 battery charge well but the lead acid still 2.4v
i left them to charge for 12 hours
the lead acid battery charging alone very well to 6.9v
is there a solution for this system and what is the right way to charge the 2 batteries
thanks
