If it is just a bad battery (not even sure they have batteries to be honest), most tire good stores will R&R the sensor for about $10-15. It is more likely though a defective seal. Replacing the entire sensor is not actually required in most cases.Is it the low tire pressure light, or the TPMS light?
If it's the TPMS light then it might be one of the sensors, as Carbuff2 has suggested.
Looks like the list price for the sensors is about $47 each. Since they are inside the wheel, you'll need a tire shop or a Honda dealer to install them.