🔋 Storage charge
Bringing a LiPo to about 3.8V per cell for storage — the voltage the chemistry is happiest sitting at.
Most chargers have a Storage mode. Never leave a LiPo full or empty for long.
What it actually does
A LiPo left sitting at full charge degrades noticeably faster than one left at roughly half charge. Storage charge is the setting on your charger that takes a pack to about 3.8V per cell — the voltage the chemistry is happiest sitting at — and it is the difference between packs that last years and packs that puff up in a season.
In practice
Almost every modern balance charger has a "Storage" mode that will either charge up or discharge down to reach that per-cell voltage, whichever direction the pack needs. Use it any time a pack will not be run within a day or two, and before any period of storage over winter.
Worth knowing
Storage charge is not a substitute for checking a pack. Inspect for swelling and damage before putting packs away, and store them somewhere cool and dry on a non-flammable surface.