I know you shouldn't keep a full charge on the batteries for more than ten days, that it can shorten the lifespan. I also realize the optimal storage beyond the 10 days is between 30% and 70% roughly. But is there any short term advantage of lowering the headroom pressure of a fully charged battery to 90% to prevent swelling for a short term beyond the 10 days. Do the gasses continue to expand while the battery is idle causing the lining to weaken beyond the 10 day limit? Is this the case for all rechargeable batteries.