I found the sword a bit to easy to do well with and that you usually don't get to use it to the full potential even if you play perfectly. I did some tweaks.

Aerondight charges now only passively downgrade to 5
Aerondight charges now give +30% attack damage per charge instead of 10%
Aeronfight charges damage bonus is for every charge above 5

Also, when you kill an enemy with max charges you reset to 5, not 0. (Was an unintended side effect, but I have decided to keep it.)

Example:

3 charges = 0% damage bonus
6 charges = 30% damage bonus
10 charges is 150% damage bonus

After leaving a combat with 10 charges and traveling for a bit you will have 5 charges