Battery runs down due to radio not being able to be turned off 100%.

The radio itself may have an internal short. Have you tried disconnecting it to isolate the issue 100%? I would start there. If it is the radio try ebay as you can probably pick one up cheap now days. Alex

'IF' the *clock* is only source of battery drain ... It would take a LOT longer than "two days" to discharge a 'healthy' battery! ... Recommend having an *auto repair facility* *load test battery* - test charging system and perform a parasitic draw test. Suspect there is another - heavier load that's draining the battery down - door lock actuator is one *possibility* .. Hands-on testing by qualified personnel will be required. ▪️https://repairpal.com/repair-shops▪️