for the voltage to drop suddenly it sounds very much like a dead cell there. you can give old packs a shock to decrystallise them, and then cycle them a few times to get the capacity back up but that isnt likely to work with a dead cell. to shock the battery, attach long leads to it and put it the other side of something solid (i use a breeze block) in case a cell pops, then connect across a car battery for ten seconds, leave for a few mins and then repeat. if after 2 or 3 mins the pack is warm then dont repeat. immediatly after, give the pack a couple of charge/discharge cycles. you are pretty safe with sanyo and gp cells, but avoid intellect cells, they go pop more easily
....always protect yourself with a solid object between you and the battery.....
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