The problem with L3 is if you use it too much, then you have to deal with accelerated battery degradation. That is why they have this section in the LW manual. If you break it down, at most 20% L3 charging and I don't think they mean back to back to back L3 charging. So this really limits how useful L3 can be as with almost all EVs using lithium ion.
When recharging the RESS, choose Level 1 (110V to 220V) charging when possible. Level 1 charging causes the least amount of stress to the RESS.
• The RESS does not limit the number of times a Level 3 DC fast charger (480V) can be used. However, morefrequent DC fast charging will stress the RESS more than Level 1 charging. If possible, avoid using DC fast charge, exclusively. The suggested best practice is to alternate your charging between Level 1 and Level 3 DC Fast Charge in a 4:1 ratio (4 Level 1 charges to every 1 Level 3 fast charge).
• The battery will protect itself from thermal damage, however extended periods of time operating at high temperature can speed the chemical aging process and shorten RESS
lifespan.
The RESS is designed to charge quickly to 80% of its capacity, at which point the charge rate then slows to reduce the rate of RESS degradation. If the battery is too hot or too cold, the charge rate will automatically reduce to a sustainable level.
Charging below 0C/32F or over 50C/122F degrees will result in significantly increased charge time. Under extreme usage or extreme temperature conditions, the RESS may limit its performance in order to prevent damage.