Just about to store my saddle packs how many volts per cell thanks

Lipos I assume? Most chargers have a "storage mode" that will do it automatically for you but if yours doesn't, something in the 3.6-3.8 range should be safe.

Thanks so I suppose it's just to take edge of it being fully charged

My Thunder Power charger calls a 50% storage mode cycle to be 7.6v total for a 2s pack (3.8v/cell) so it's a little more ran down than just taking the top off a full charge (which would be 8.4v or 4.2v/cell for the whole pack).