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Oops. I meant to say "periodically charge the lower battery", since you will be depleting the lower one more. With the lower ones showing less voltage, that means that the 24 or 28V that you charge the stack of batteries with will put more than half the voltage on the upper batteries. Yes you...

See Marlin P. Jones and Associates. MPJA - Power Supply, Power Supplies, Security Cameras, LCD, Fans, Etc. for several down-converters that take in 24 and put out 12. A "reducer" might be a resistor. If you have a constant load, that might work, but as the load varies, so does your voltage...