I have an arduino project that will require 5V to operate few sensors that can only work with 5v not 3.3. The project needs to be powered by batteries, using solar cells to recharge it. The point is I can only find litium batteries of 3.7v here. so the questions would be:
Can I use 2 litium batteries in series to generate 7.4v ? I believe so, but more important, how can I recharge these batteries using the standard 5v cells ? Any idea ?
Would be feasible to implement a level shiftier from 3.3 to 5v ? What would be the implications of this ? And how could I do this ?
Many thanks in advance