WARNING - DON'T DO BUSINESS WITH THIS VENDOR. I place an order for two Inogen batteries ($750) on their website. There was no notice they were out of stock, and these batteries were needed for an upcoming trip. They sent me a confirmation saying they were getting my order ready to be shipped. The next day I received a notice that they were out of stock and the batteries would not be shipped for 26 days. The customer service rep suggested I look elsewhere, and call them to cancel if I got the batteries elsewhere. I did find them elsewhere, and they were shipped to me in 2 days. I wanted to receive these batteries to be sure before canceling my Help Medical order. However, on Friday 4 days after my original order Help shipped the batteries. I got the first shipment on Saturday, and of course I could not cancel the Help order since it was a weekend. I called them Monday and was told they have a NO RETURNS policy on all products sold. I never received any information on their policy in any order, confirmation, or during the order process. It is buried on their website, but you will never see it unless you go looking for it. The customer rep was curt and dismissive on the phone. BEWARE HELP MEDICAL. There are many better suppliers with reasonable return policies and much more customer service orientation.