We launched a new package sticker for iPhone 4s, 5, 5c, 5s, 6, 6 plus batteries to reduce the risks during customs clearance. This new battery label looks very similar to the original battery in appearance with sensitive information removed which reads on the front:

REPLACEMENT BATTERY
Compatible with : iPhone 6
Read instructions before installing and using this battery.
Li-ion Polymer Battery 3.8V 1810mAh 6.91Whr
CAUTION
Do not puncture, crush, disassemble, or short circuit this battery. Do not expose this battery to water or fire.
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