Just about yes. usually charge them every 2-3 days. Charging time approx. 40min

Yes, it does for me. Without any problems.

In theory, yes. I charged mine up to 100% at 23:00 last night. Now (12:00, midday) the app says I have 1 day 23 hours remaining. I usually charge it every couple of days. Battery life will depend on what features you have enabled, also on activity, I've found. I have had more than 2 days out of it on a couple of occasions.