The original 350ma was to "soak" charge the PAC to revive unbalanced cells. He since saw the wisdom in being able to fully discharge and re-charge the battery to recover capacity. The time for that to occur, using 350ma, was judged to be excessive, so, the later models (the current models) have both 1 amp and 350ma rate. The 1 amp rate is use for the majority of the charge and the 350ma to finish. The 350ma only charger will do the job but take a lot longer.
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