It is recomended to charge them to 70-80% for storage. This is because temperature variations will impact the chemistry and internal voltage of the pack. Fully charged at one temperature is undercharged at another and overcharger at yet another.
The 20-30% margin means that this won't be an issue. Lipos also lose very, very little charge over time so with 70-80% they will unlikely ever discharge to too low a level.
With the fact they have little or no 'memory' effect leaving them at 70-80% is fine.
James
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