Battery balancing circuit
You are much better off making ideal diodes using MOSFETs 




Replaces a Power Schottky Diode
Internal 20mΩ N-Channel MOSFET 
0.5μs Turn-Off Time Limits Peak Fault Current
Operating Voltage Range: 9V to 26.5V
Smooth Switchover without Oscillation
No Reverse DC Current


But the simplest solution is a better Schottky Diode Array $6 with a heatsink


These are common cathode.