There are three scenarios:
4 AA batteries connected in series would produce 6V. I'm planning to supply the output to an LM7805 regulator and produce 5V. The output from the regulator then will be connected to the charger cable (torn apart from the original phone charger) which will be inserted in the phone (3.7V 1300 mAh Li ion battery).
I'm guessing although the batteries will produce 6V, the current supplied will be too low to charge the phone. So adding 6 batteries instead and following the same procedure as mentioned in (1) could work.
4 AA batteries connected in series and the output (6V) is delivered to a XL6009E1 boost converter (5V to 35 V) tuned to produce 15V. The output is then supplied to an LM7812 regulator to stabilize the voltage output and the output from the regulator is directly supplied to a 12V lead-acid battery.
- I need to know if all these systems will work. If not, then please mention the corrections required.
- The current supply will be quite low to charge the batteries in all these cases. Is there any combination of series-parallel connection for the AA batteries to obtain the optimum voltage and current ratings?