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The backup battery is the battery that is inside the ECM itself. The ECM has a battery to keep the memory alive so you don't lose programming in the ECM for the truck to run properly.
When you get that code, the ECM needs to be sent out so the information can be transferred off of it, the battery changed, then the information put back onto it.
A few Freightliner shops can do it in-house, but there are many that can't or won't because a clean room is needed to do it. Iv'e tried changing one once and ended up bricking the ECM, then had to program the ECM of the main server with the as-built data. They are tricky to do, but can be done if you have full programming capability.
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