Thank you all for your replies.
Our POS in the gift shop is Quickcharge. We requested this year for a mobile register that would have backup battery and operates from wifi. We have a mini version of this for our auxiliary sales that we use a laptop and do payroll deduction on.
This mobile register looks just like a cash drawer, receipt printer, credit card machine and orbit scanner for payroll deduction. I'll submit a photo once the unit is fully set up on the cart. The battery back up just needs to be charged nightly and since the register has a locked cash drawer that can only be opened by the register we feel this is safer than a cash bag they are now using.
Our inventory for the cart comes from our gift shop so we will be able to carry many options on the cart (magazines, word puzzles, pens, badge reels, etc). Our coffee cart is such a huge part of our volunteer department but has been slowly dying with no one carrying cash any more. We thought this could be a win win for our volunteers, the patients, families and the employee to offer all forms of payment.