Hi and welcome,
If the red led is solid, it needs to be charged.
"
LED indicator:
Battery indicator: 60% plus = Green - Blue 30-60% and
Red below 30% capacity
Whilst charging it will indicate as follows: 60% plus will flash Green, 30-60% will flash Blue, and below 30% will flash Red. Once fully charged the LED with be a solid Green
Protections:
Low battery – Red LED will flash 10 times and
device will not fire.
Short circuit / too low resistance – LED will flash Red 3 times.
No Atomiser / open circuit – LED will flash Blue 3 times
Over time – the LED will flash green 5 times if
vaping time exceeds 8 seconds."
HTH
I