Power connector for small product
That would be a perfect choice. It could however a bit bulky in size. Since you said that currently is relatively low, you could try using one of these:



These babies are straight panel mount female magnetic connectors. I fyou dont mind wasting a bit of money and having to make a special charger for this, your project would look "futuristic".

Anyways you could use this type of common mini-usb adapters too as they would be cheaper, although they are not perfectly panel mounted. tHEY WOULD DO THE JOB JUST FINE.