Help needed desperately ! (Question related to batteries) Answered
Recently I planned on making an portable phone charger the classical way, with a car phone charger. But then I came across the problem of choosing a battery. The 8 AA batteries way is not economical, as I will be charging a Sony Xperia Z1 and it will drain the batteries in one charge. The 8 AA rechargable battery method will be better but will set me back about $20 so that's a no. If I use a 9 volt battery it will charge the phone 20%. The final and the most stupidest method is to connect 10 9v batteries so that I get 9v 4 amps but that will be too bulky. Lithium batteries are useless as I will get the required amperage but the voltage will be too low and the other ones will once again set me back too much. So the only way is to use 8 AA batteries but every phone charge will cost me approx. $1. Is there any other cheap way or 8 AA batteries it is?
Thanks in advance :).