Extender

Hi everybody,
I would like to know if the TQ50 extender is acting/working as a real battery able to feed the motor or as for the Mahle system is merely a power-bank.
More clearly in case the 360wh battery is fully depleted it's possible to continue the ride using the Extender assistance?
I planned an Alpin tour ( 45 km- +3.500 mt elevation gain-8,5% average gradient) not sure the main battery shall be enough ( all climb in ECO mod) but I can count on my Partner's assistance whom follow by car. The strategy is to start light without the extender and to use it only if requested.
I have not experience either with TQ's assistance as I just swap from my Cervelo Rouvida AXS FazuaRide60 to Pinarello Nytro E7 Road.
Thank
ps: After 3 + 1 motors with problem covered by Fazua warranty I decided to change even because the Fazua future remain very uncertain
 
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