Model: RH03XL. RH03XL RH03042XL RH03051XL RH03051XL-PL RH03054XL. 1X RH03XL Battery. Shut down and disconnect power, remove the battery, then check it directly. On the upper right corner or front side of the old battery, look for a large-font black box code that must contain "RH03XL ".
