Upload takes a long time but good help with empty battery

My last phone - also from Nokia - had a Stanbyzeit of 450 hours - accordingly long was the talk time. But since that is the case only for very simple cell phones - and any additional function of mobile phones seems to walk on the battery life, my jetz term has a much lower Spechzeitleistung. Since I telephone with flat, and sometimes also very long - on boring train journeys ... I always had to fear that I for an emergency call - no longer have enough battery or fuel on the return trip. Then the Power Charger is now easily connected and continue telephoning. Of course, there is another part which one carries around with him, but is very thin and light. And does not have to be in your pocket ... It just phoned more relaxed, or takes place on mobile phone with Ovi Maps around ... if you do not have to constantly worry about the battery.
Charging time I find very long - longer than the cell phone charging time, - but does not bother me.
Would fear for anyone who has a mobile phone Flat, like the phone, and then not to the juice for an emergency call a strong buy recommendation.