This chassis is made to hold a standard 3.7V rechargeable battery and slide into a 1" diameter hilt. The Prizm sound card fits perfectly on one end with easy access to the micro SD card and RICE port right below. There are 2 wire channels that allow for wires to be passed from one end of the hilt to the other end. We recommend adding a little bit of electrical tape around the battery circumference and around the chassis circumference to snug up the fit when sliding the battery into the chassis and sliding the chassis into the hilt.