Yes, you can. Please read the attached document in it's entirety, or watch the video in this link for instruction on how to replace the table tent batteries.
The battery replacement is a self-service process, requiring a CR2032/3V coin cell battery (220mAh capacity) and and TA20 Triangle Head Screwdriver or Insert Bit.
The expected battery life for the dual beacon tents is 12-14 months. The expected battery life for the single beacon tents is 60-62 months (about 5 years).
Improper battery removal or tampering with the table tents will void any existing warranty. Please contact Radius Networks Support for any additional hardware related questions or concerns.