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When cells are hard wired in parallel, they become like one cell so balancing is not an issue.
If you're thinking of the kind that use round cells, they're generally series packs. The Darwin uses two individual LiPo cells in parallel so at least they don't think there's any problem with it. Laptop computer battery packs are generally a 2x4 configuration of 18650 cells. That's where two cells are in parallel for each set of cells in series.
I just looked for 3.7v Li-Po packs and couldn't find any.