Yesterday was the 5th anniversary of my 2014 Leaf. 148500km, 92200mi. Still haven't lost my first bar, SOH ~87%.
Secret sauce - keep it charged at 80% by default. You can charge as soon as you want (if battery is not hot).
Don't be afraid to drain down to 3% on weekly basis.
Don't be afraid to continue charging above 80% in winter to compensate for range loss due to cold weather BEFORE departure.
Keep temperature up to 5 bars for most of the time.
Do not recharge above low battery warning if above 7 bars. It's ok to continue the trip and quick charging until destination.
Rapid charge for short time - I often charged 10 minutes, just to reach destination or next charger. Then charge on 230V.
If battery is warm (6 bars or more) - be gentle - don't floor it, just drive fast, up to 105km/h(65mph) is really ok for gen1.
You won't build up more heat this way and you will lose heat after rapid charging.
Right now it is the hottest weather for my Leaf, 29*C in shade. Battery 29-32*C, 6 bars. I can't get above 6 bars without QC.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW