I have a number of project that I would like to make available in the event of a power outage. None of them are especially power-hungry, but some are sensitive to voltage ranges and require a regulator (others do not). Let's take a RPi and a ESP8266 as examples. The Pi will work just fine from a Li-ion battery while the ESP needs to have a regulator to get it down to >3.6V. What is the proper way to hook up either board, a Li-ion charger, a Li-ion battery, and a regulator (for the ESP) so that the boards run from the battery when a charger is not present but run from the wall and allow the battery to properly charge? Do I simply hook up the board (plus regulator) and the battery in parallel to the charger, or is that unsafe? I always get a little nervous when messing with lithium batteries (or any rechargeable battery, for that matter - they're all a tad volatile).
Thanks!
Thanks!