Separate names with a comma.
I hope the coming 4.4 Kit-Kat firmware can correct this
I think you need charge your battery overnight(6-8 hours), don't believe the indication of the firmware OR even power off the phone indication...
Mugen was released one, check it out
Mugen Power 3800mAh Extended Battery for Motorola Droid 4 XT894 Verizon XT 894 | eBay