C&D Technologies RS-990 Liberty Series 1000 - Manual (Page 17)

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resistance for each battery. A wide variation in circuit resistance can
result in unbalanced discharging and charging of cells. As a
consequence this can produce unequal float voltages of the
connected cells and individual strings can sustain a loss of
performance and capacity, resulting in higher loads on the other
parallel strings with lower cable (circuit) resistance.