Here was my test results using a PA on a Fully Charged new Solo
I used it for a full hour straight on level 7 with the PA . 5 sessions
It didn't tripped the charge sensor , not once .
By that , I mean the green flashing light didn't come on .
I'd unplugged it , let it cool a few minutes .
Then plugged it in to the regular charger .
It was charging , it was still on 7 , but needed topping upull
for about 20 minutes .
I thought it was strange that it didn't kick into charging mode
while using the PA . It definitely lost some battery power .
But then , the other
Chap @Pipes , said it may take about 6
sessions to trip the sensor ... more testing