I am designing a solar 7.4V Li battery charger, and want to include gas gauging, and cell balancing. If I use passive cell balancing, I waste power and cause my coulomb counter to lose count. Is there a way to balance the cells without affecting my gas gauge? I'm trying to stay away from the complicated $10+ active balancing ICs. Is there a discrete solution?
Specs: Max charge/discharge: 2.1A
Max Vin: 8.4V
Battery: 2Series, ~2000-3000mAh
Two ICs I am considering:
DS2745 <-Gas Gauge
BQ29209 <-Cell Balancer