LiPo batteries in these devices are probably single-cell batteries, so 'balancing' shouldn't be required. Balancing is usually done on multi-cell configurations. If the charging circuit in the device doesn't support balancing, then there's no good way to do it, discharging or charging. If the logic isn't there, then it's just not there. They also don't have a memory, period. Their performance does degrade over time, just like any other rechargable battery though, so capacity will change over their lifetime.
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