I know (knowledge), it does not need to Brummer actually ..... I have but if required a 2nd normal battery on hand (in your pocket) or in luggage. Unfortunately my SAMSUNG Note eats a lot of power ... when Bluetooth and the Internet is on, you make some changes to the system - and not be home, but somehow, somewhere is on the way and one imagines that it now - right now and having to do outside the home ... Since holding the 5000 mAh before 3 days and the 16 euro .... The normal battery (2600 mAh) is most often after 4-6 Stungen because already in trouble need. Once again, only for iron reserve required. Notpuffer. Good gut feeling. A real emergency battery as offered with etlich higher power, he does not want to compete, too. What should I with 12,000 mAh to 43 euros? And that's a cheaper. Since there are already expensive. Ergo: For just 16 euros a truly fitting lid, which looks like the original ... fits already!