I've tried searching through existing topics but haven't found an answer. I'm a beginner enthusiast. I have a couple of questions that I would appreciate input for. My plan is to make a battery pack that can be charged via wall adapter/PC/solar. I have found information here that helped greatly.
1) I plan to use 2x 18650 batteries in parallel as the power supply. The only ones I can find are rated at either 35A or 40A. All others I have found do not list the amp value.
2) Through other questions/answers I have been made aware of voltage boost modules. My concern is that the ones I have been able to find specify a max input of 4A from the battery source. Will the batteries I mentioned above fry the circuit? Will I need to make a step down circuit between the batteries and the voltage boost module to decrease the amps or an I just overthinking this?
3) The modules I found have mini USB connectors for charging the batteries. Can I tap this circuit with a solar panel (with inline diode) to charge the pack instead of a wall adapter or PC? Will I still be able to use a wall adapter if I do this? What is the lowest maH value that would provide a reasonable recharge time? I realize the charge time would increase due to how many batteries are used.
Thank you for taking the time to read this.