I've only had my AuraOne for a couple of weeks but I haven't experienced any fast overnight drains at all. The biggest drop I've seen from putting it to sleep at bedtime and waking it up 12-hours later has been 1%.
I do have the Sleep Accessory function enabled because I have a home-made cobbled together sleep cover. (It's probably the ugliest cover in Kobo-land but will have to suffice until a proper 3rd-party Slimfit cover becomes available).
Apart from that, Wi-fi and every auto-sensor option have been switched off since day one. I always have the light setting at 5-15% depending on time of day. I'm not trying to say that this minimal-setup ought to be acceptable to everyone but I can easily live with it without needing to fret about when the new firmware will arrive. To be honest, I could probably live with it as-is
ad infinitum.
Of course, I might feel differently if I was seriously considering sending the device back and I was running out of time.
Just in case it's helpful to anyone, these are the relevant settings in my config file,
.kobo/Kobo/Kobo eReader.conf
Code:
[ApplicationPreferences]
AIRPLANE_MODE=true
PeriodicAutoSync=false
[PowerOptions]
AmbientLightSensorEnabled=false
AutoColorEnabled=false
SleepAccessoryEnabled=true
TurnOffLightInBrightSunlight=false
With expectations so high for the new firmware upgrade I really hope it isn't going to be a disappointment. I can't help feeling that all these auto-sensors may continue to be battery hogs. Let's hope I'm being overly pessimistic
