Did you buy these from a reputable dealer or from a person or eBay?
Reason I ask, is that battery usage is indicative of AIRSOFT KNOCK OFF stuff. Depending on the model - real Peltors or Sordins ought to be running about 100 plus hours.
I am not saying yours are "Z-TACTICAL" knock - offs, but - that is an issue the airsofters have with their knock-off earpro I am told.
I am sure there is a youtube video or something to help you identify if your earpro is legit.
Best of luck.
~Will