I've got a project that utilizes a Pi0w and a 12v accessory. It has to be portable, so I'm using a lithium ion 18650 and a boost / charge module.
On its own, this setup works perfect, my issue arises when I want to add a 12v accessory. I want to avoid boosting the boosted 5v to 12v because I aim to draw more current than a single boost unit can handle. My idea was to add a second boost module to the battery, which has a variable input and output. I believe this should work as long as I stay below the C rating of the battery, but I am unsure what happens if I try to charge the battery. Is it okay to do this or will I see a higher voltage than 12v coming from the second boost module?
Here's a rough diagram for context.
Note that I accidentally mislabeled the output of the second boost module as 5v, it should say 12v.