Storage voltage, cell balance maintenance, recognising damage, and the habits that take a pack from 80 cycles to 250 — for every RC category.
The single most important LiPo care habit is storage voltage: never put a pack away fully charged or fully discharged. Use your charger's Storage mode to bring every pack to 3.75–3.85V per cell before storing. Combined with charging at 1C and avoiding deep discharge, this habit alone separates packs that last 50 cycles from packs that last 250.
A LiPo cell stored at full charge (4.2V) undergoes continuous low-level oxidative stress. The same chemistry that enables high discharge performance makes the cell unstable at the top of its voltage range over days or weeks. A cell stored deeply discharged (below 3.0V) risks irreversible capacity loss and may not accept a charge afterwards.
Storage voltage — 3.75–3.85V per cell (11.25–11.55V for a 3S pack) — is the stable middle state where cell chemistry is under the least stress. Most balance chargers include a Storage mode that reaches this range automatically. Use it after every session where you are not flying again within 24–48 hours.
After the last flight of the day, put every unused full pack into Storage mode before packing up. Takes two minutes and is the single habit most associated with packs that last 200+ cycles.
Cells within a multi-cell pack drift in voltage over time. As imbalance grows, the weakest cell limits the entire pack — the charger reaches target voltage while the lagging cell is still undercharged, reducing usable capacity. Balance charging on every cycle is the primary defence. Persistent imbalance that does not resolve after repeated balance charges indicates a degraded cell — the pack is approaching end of life.
Before every charge session, visually inspect each pack. Run your fingers along the cell faces — a healthy LiPo is firm and flat. Any soft spot, bulge, or asymmetric swell indicates gas accumulation from internal reactions. This is puffing, and it is a safety condition. A puffed pack must be removed from service immediately — do not attempt to charge or fly it.
After any crash, inspect the pack even if it looks undamaged — internal damage from impact can produce puffing on the next charge cycle. A pack that arrives at the charger significantly warmer than ambient after a crash should be retired.
See the post-crash inspection guide for a full protocol covering airframe, motor, and battery assessment after an impact.
Three conditions warrant immediate retirement: visible puffing or swelling, persistent cell imbalance that does not resolve with balance charging, and significant voltage sag under load that reduces flight performance noticeably compared to a new pack of the same spec.
To dispose: fully discharge using the salt-water method, then take to an electronics recycling facility. Many hobby shops accept retired packs. Never place a LiPo in household trash or curbside recycling.
For the complete battery reference — S-ratings, C-ratings, charging, and connector types — see the RC Batteries Guide.
10-page PDF covering the equipment checklist, LiPo handling protocol, pre-flight routine, and the 5 most common beginner mistakes — formatted for the field.