Well I bought mine in late 2013 so it's not that old as yours but were you seeing decrease in battery life before flashing this rom too or like me you saw major decrease with this rom?As I mentioned previously, I was getting terrible battery life. But it was expected as it was original first battery came with phone and and my note 2 is 3+ years old.
I was going to buy original battery, I saw online which comes from 600 rs to 1400 rs and they all claim to be original but most of the reviews are negative So I went to service center and original battery price was 2200rs I was not going to spend that much on battery so I went to local shops and saw intex battery for note 2 and I bought it for 550rs. (when I saw online later I could have got it 50rs cheaper but nonetheless). So I am posting screenshot of first charge. Battery was already 60% charged and I tried to charge and it was taking too much time like 10-15% an hour so I thought maybe it's first time so I left it to charge overnight. So I disconnect charger around 5am today morning. Since then it's not plugged to charger. Here are the screenshots.
I previously had resurrection remix marshmallow and it's like a known cm Android 5+ issue to have a little decrease in battery life than android 4.4 roms,but even then I could get 1.5 days of heavy to moderate use but now my phone is dead every night with mild to moderate use.
I will leave as it is for couple more days and maybe restore v6 backup if things remain same.