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uc3906 charger, overcharge time

Other Parts Discussed in Thread: UC3906

I have build float dual charger using Uc3906. Results is very good. But I have a problem. battery voltage is reached from 23.5 to 27.5 Volt aproximately 4-5 hours; on the other, hand , reached  for  from 27,5 to 28,2 Volts aproximately 8 hours. This 8 hours very long and I want shortened %50. What should I do?

and other Question: Dual charger (not float) schema include RsH and Re; how I calculate this resistors value ?

Thank you