Jackpot, part le deux:
Emergency Power from Solar ... - Google Book Search
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The result of these [parallel battery] voltage differences can lead to inconsistencies in the treatment received by each battery (cell) in the bank, potentially causing unequal capacities within the bank. The parallel strings with the lowerst circuit resistance to the charging source will generally be exercised to a greater extent than the parallel groups of batteries with the greater circuit resistance to the charging source. The batteries in paralle strings which receive less charge may begin to sulfate prematurely
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AND
Practical considerations : BATTERIES AND POWER SYSTEMS
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we must be sure that these batteries are of equal voltage. If not, we will have relatively large currents circulating from one battery through another, the higher-voltage batteries overpowering the lower-voltage batteries.
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I guess it's all about forming the right Google search terms...