Very easy, would purchase from them again. Great customer service. I placed 2 orders within a short time, both with 1 day shipping. I emailed to ask if the orders could be combined, for one shipping charge, and they gladly did that and refunded one shipping charge. Things beyond their control happened with UPS and FedEx. My order apparently waz returned to the warehouse, after it had already been picked up to be sent, as apparently the rules changed that batteries now required 2 day shipping. I placed my order Jan 4 and received it Jan 9. I was refunded even the one shipping charge. This company has excellent customer service, and I would absolutely recommend them.