Newbie level 5
Now a days mobile phone comes with different batteries rating 1000mah to 4000mah. but actually any mobile phone takes current to some extent only.so how can we justify that a battery with larger ampere rating give more backup. Because for example a 1.5v *2 AA battery lasts long than a 3.7v mobile li-on battery(650ma appox.) with used for same load.Finally I assume that a battery with more size or amps to considered when buying?