Nobody really knows for sure what factors accelerate degradation the most...
FWIW, here's my list based on what I've read online:viewtopic.php?f=9&t=25002&hilit=degredation#p513110
I personally try to charge to 80% max when I know I won't need additional range and I try to not let the SOC drop below 20% (again, if I don't need the range). There's some evidence that limiting the depth of discharge is better for the longevity of the battery, but again - speculation.
Having said that, I don't hesitate to charge to 100% SOC when I need the extra range and I do so roughly once a week to balance the pack too. I've also run the pack down to VLB a few times, but I also try to charge it immediately after doing so. I don't let the pack sit at 100% SOC for more than an hour if I can help it.
So far, so good as I've still got 12 bars on my 2013 SV that's over 60k miles now. Lucky to live in a very moderate climate, as I suspect that's the primary reason the pack is in good shape and that my charging habits have little to do with it...
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV