[JasH]

Daily LOG with notes. With Key unused, and simply checked daily using an Alexa daily reminder at 9pm.

Conclusions are:

1/ Key battery life is rather short at 16 days.
2/ Battery indicator is faulty, as the battery was depleted virtually as soon as it indicated 50% life remaining.
3/ Battery indicator is not fit for purpose.

Outcome:
BMW replaced my DisplayKey today under warranty (but new key is not fully working yet, as it has less info and will not pre-condition i8)




DisplayKey LOG:

Wirelessly charged 100% 10 Feb 2019, 18:29. Display indicates full battery.

12 Feb, 21:14. Full battery
13 Feb, 21:00. Full battery
14 Feb 21:00. Approx 90%
15 Feb 21:24. Approx 90%
16 Feb 21:00. Approx 90%
17 Feb 21:00. Approx 90%
18 Feb 21:00. Approx 80% - hard to be sure, could be unchanged at 90%
20 Feb 21:00. Approx 80%
21 Feb 21:00. Approx 80%
23 Feb 15:42. Approx 80% - hard to be sure, this and above ones could be 75%
23 Feb 21:00. Approx 75% - as above, could be 80%
24 Feb 21:00. Approx 75%
25 Feb 21:00. Approx 60%
26 Feb 21:00. Approx 60%
27 Feb 21:00. Approx 50% - but Key “crashing” and shutting down. This is the usual first sign of v low battery. Screen therefore effectively unusable properly. Then tried to use it again, and key will not activate (display remains off).
Placed it on wireless charging pad & tried to activate & charge it. Screen shows charging symbol, but otherwise will not active (boot up).
Checked every 30 mins.
27 Feb 23:01. Shows 100% but is still charging. Key can now be used.
27 Feb 23:08, screen self-activated and the key completed charging.