Portable phone charger running on batteries

Thread Starter

Rudy Melo

Joined Jun 3, 2015
5
Hello, I am wondering if I can make a phone charger that has an output of 5.2V 1A and as efficient as possible running on batteries. I have 7805 voltage regulators and lm317's but when I use the 7805 with a 9v battery, it does not supply enough current to make my phone battery percentage go up...it just remains constant (I believe 300mA or so if I remember correctly). How can I go about making this? Any ideas? Thank you in advance
 

MikeML

Joined Oct 2, 2009
5,444
A better battery, and a switch-mode regulator/converter for higher efficiency compared to a linear regulator.

If it takes 4hours to charge your phone, the battery will have to supply 1A for 4h = 4Ah. I would use a 6V SLA, like this:



Even bigger, if you want several phone charges before having to recharge the SLA.
 

Alec_t

Joined Sep 17, 2013
14,280
Probably cheaper just to buy a portable charger for the phone. Google 'portable charger'. There are lots available.
 
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