These batteries were well maintained and show no signs of abuse and were manufactured in 2015. The various units have the security label on them from Inogen and all of them have the associated Serial Number. Other than some minor wear they look and perform like modern. I imagine in a fair price for what you’re getting, because these batteries are used plain and simple. I can’t guarantee battery life or charge status. Then again, I test the entire batteries with an Inogen BA-303 external battery charger and all ship with a full charge and are in a position for use upon arrival. I do accept refunds and or exchanges for so long as my inventory holds up.