Running two battery sets in parallel

Just learned how to insert pictures.
This is the schematic for dual battery sets.

Once again, if you wire your batteries together with out the diode, they will work, but as the batteries age, the worst one will pull down the whole system.

I bought the bridge rectifier from Frys for $7. It is an NTE5340 and can handle 40A.
The two battery sets go in on the two "AC" lines for the rectifier. The Chager connection goes on the DC- line, and the motor controller goes on the DC+ line. It worked great!