Has something changed with the 9.40 that affects battery life. I feel mine is draining extremely fast. It was at 67% yesterday and today is 44%. I only road for an hour. I have auto brightness off and backlight set to off. Not sure what is going on.
i have ~2.5% per hour battery drain (with 3 sensors and 1sec recording). usually the BT connection is the problem after a fw update, remove the BT pairing from your mobile and from Edge and repair everything. if it doesnt help, do a master reset in the Edge and repair/reset everything.
i dont use BT connection on my Edge(s). But if somebody has higher battery drain than the normal ~2.5-4% per hour without navigation, then there are those 2 things are the culprit unfortunately, due to the "amazing" programmers at the Garmin HQ. this is how all Garmin devices "work" (probably You are a new user if You dont know these issues , it is "known" facts for old (~10years) users as i am ...). So If You have high battery drain, 1.: remove and repair the BT phone connection in Edge and in the mobile. If it is not helping, then You have to do a master reset in the Edge , and if it is still not helping , then You have a faulty device or the latest firmware version has bug and You can send a complain to the Garmin Support . but as we (and as the Garmin too) see, only 1-2 users have such an issue, so it is not fw related, it is only invidual problem, something is corrupted there and has to be fixed by the user itself