2010 s550
Try jump starting the starter battery in the front to get the car started. You may need to let it run for a while as the accessory battery charges. After a while, those messages should disappear and you should be good to go.
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The consumer battery between the rear seat& the trunk of a 07-08 is the same size (Group 49 I think) as the only battery, under the hood, in the 09 & newer.
(The blue tooth puck for size reference)
This is under the hood in the engine compartment.





