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Bojan is right for most people if they are not familiar with the effects of unbalance in parallel connected batteries. With top quality deep cycle batteries it is the done thing to increase capacity but here the design of the batteries is intended to take care of this.
However many of the cheaper storage cells available these days do not age at the same rate. Thus after a few charges and discharges the unbalance will become enough to destroy both cells.
I have carried out tests using older units (identical outward appearance and same age) that have shown this to be the case. The first couple of charges gave double the battery charge life but after six charges the life was less than one battery and after the next charge both batteries were useless. Using other batteries from the same batch singly has allowed them to last through many charges. I have one particular old golf buggy battery that was no good in the buggy any more but has been in use for driving my LX200 in the field for six years.
Barry
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