That's standard too. If you try to charge it, it could judt explode. That's how lithium batteries are. (And you couldn't blame Verizon if your house went up in flames.)
You're not supposed to allow the battery to drop below 40% if you want it to last - and with phones being built so that you can't just pop the back cover off and stick in a new $9 battery, it's more important than ever to take good care of them. Once you're out of warranty, if you still have the phone and the batery goes, you pay to have it replaced. (The last Samsung price I heard was $60 plus you pay to ship it to them), but that was a while ago, so it could be more now. And you still get back your old used phone. At least this time you're getting a refurbished one.)