Levo SL Gen 1 SL won't switch on

[Harry Fettes]

Hi
I'm having problems with my SL. It won't switch on or start charging. I plug the extender battery in and it switches on without issue. I switch off and remove the extender battery and switch back on and it's fine. Switch off again and plug in the charger and it charges.
Once switched on it performs without fault but if switched off for a day the issue returns.

 

[Mikerb]

flat TCU battery

 

[Harry Fettes]

That had crossed my mind. However there was no warning. When the battery was on the way out on my Turbo Levo I got alternating red & blue LEDs. TCU reset and battery replacement will be my first and second actions if I don't hear anything more definitive.
Thanks for the input.