You'd be surprised at how much capacity can be lost by a particularly bad imbalance, but a replacement certainly can't hurt. If I were in the market to replace my pack right now though (which I'm not - the pack is still very strong despite being 16 years old), I'd probably wait until this fall to see how the lithium replacement being developed over at Insight Central turns out. It would be nice to have hours of assist and the ability to safely top it off at home every night, rather than the ~10-15 minutes of assist a strong, new pack can deliver.
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