Trying to charge my initial battery to full so I can take it out and put the backup battery on the charger... and the last 10% recharges at a snails pace.
But ya, I am noticing that too, it quickly drains the first 10% for me as well, then takes forever to run down. An iPhone 5 user tried to tell me he only used 9% of his battery with heavy use. Trying to explain to him that his battery was about 1\3 the size of the Hyperion 6200mAh was like trying to explain it to my dog at home, so I showed him where he could see phone use since the last recharge. Once he realized it read 47 min of use, he dropped the subject. LoL!
Do you many battery saving settings with your phone? (brightness set to auto, slowing the cpu, etc) I haven't changed anything yet, but I might tinker with it this weekend.