Flashing dash lights

[D&D]

My DK5310 would not start this morning, 20 F. Dash lights on, turn key, nothing. Went and got a jumppack, dash lights on, turn key and very light on the dash is now flashing. Tested battery and it has a bad cell (or two?). Came back with new battery, dash lights on, turn key and it starts.
From reading, all dash lights flashing is a critical systems failure. DTC codes will hopefully lead you to which critical system is dead
Just a heads up post because I’ve never seen this before on any brand.

 

[RjCorazza]

I read a thread several months ago about low or bad batteries frying ECM's due to low voltage / high amperage through the circuit board.
It was concerning enough that I swapped out my 10 year old battery that had been cranking slower than usual.
Hope you get it straightened out.