I would like to build an autonomous system that contains: - An Arduino board (later, it will be just the chip) - A LED strip
I decided to use 3x3.6V lithium batteries in series. So, the idea is to have the 3 batteries in series that supply the Ardiuno board and the LED strip in parallel.
Now, my problem is the charging the batteries.
After research online, I see that the best solution would be to charge them in parallel. There are many dedicated charging circuits on eBay or aliexpress for charging at 4.2V, is that good ? To be able to have a good charging time, I need a output current of 2 or 3A, right ?
If this solution is good, when a will plug the 5V input and charge batteries, there is no risk for LED strip and ardiuno board ?
Or I will have to open the circuit when I plug my supply ?
When I will plug my supply, it will apply 4.2V on each battery. So, in series, I will have 3 x 4.2 = 12.6V. So, I need to check if LED strip and arduino if ok with that voltage, right ?
For arudino, it should be ok, for LED strip, I'm not sure, the normal voltage is 12V.
Thanks for your help,