There's definitely something going on- I reported battery concerns earlier but I'm finding it's not consistent. Some of my batteries are less than optimum, but I also have a new VTC4 and I'm expecting those Panasonic NCR18650LFs are in my mailbox (although I'm waiting for a reply or comment on those Hybrid IMR LF's specifically).
Make sure you clean everything - threads, bottom cap, contact, battery ends etc...
I'm starting to suspect something with the bottom spring

- noticed a big improvement when I soaked it in PGA (I have a small flask I use for deep cleaning that barely fits). Also I swabbed the connector with a well soaked qtip. Now (on my 3rd day) my VTC4 is getting acceptable 7-10 hours which is ok for me- not as good with the AW's.
Also, I've noticed it'll drop down to low 80%'s then stay there a while before plunging quickly to single digits where it stays for a while before hitting empty. If I remember, I'll check the loaded voltage on a p2.5 before recharging next time.