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I'm a bit confused...

I was under the impression that this problem was with the unsealed batteries (the ones you can add water to) and not the sealed units. Is this correct or not?

The reason I ask is that this last post here refers to the 1000 having this same (and possibly defective) battery. Now I'm positive that my battery is the sealed type. If this battery is still susceptible to malfunction, I'm headed to the shop tomorrow to get a new type.