The Note 4 had a decently large 3,220 mAh battery and recharged somewhat fast, but it's nothing compared to what's coming. The Note 5 had a smaller battery which was a huge letdown, and Samsung learned from that mistake.
Rumor has it the new Note 7 will employ a large 4,000 mAh or 4,200 mAh battery instead. That should last plenty long on top of Quick Charging, Wireless Charging and USB Type-C.
Along with a huge battery that lasts forever is a reversible and universal USB Type-C port (not micro-USB) and Quick Charge technology. Quick Charge 3.0 allows smartphones to recharge from 0-80% in around 35 minutes, which is just insane fast. Meaning a quick drive home or top-off while you're getting ready will give you more than enough for an entire day, maybe even 2. Rather than waiting 2-3 hours for the Note 4 to recharge, get 80% in 35 minutes on the Note 7. Impressive, right?
It will also support fast wireless charging which will be faster than the older Note 4.