By multicharger i take it you mean a charger with a variable resistance - I.E. it only charges at the rate needed by the battery somewhere from 12ohms down to 0 ohms (fully charged). These are the best type of charger to use for any battery, but you may find with batts link in series it will only drop the rate to 2ohms min because of the resistance made by linking the batts, but that doesn't really matter.
Some people buy cheaper chargers that charge at a flat rate until you turn it off, these are pretty bad unless you time the charge accurately, most people prefer to chuck it on charge and forget about it until the next day !
Because the GEL batts are totally sealed there is nowhere for the gas to escape if you charge them too quickly they produce too mauch gas and split/the cylinders or cells split and the plates touch which sparks and they explode, when charged at the correct rate (printed on the label somewhere) the gas produced is minimal and not a problem.
Also the build quality is a factor, cheap is generally nasty !
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