One of the main problem in battery powered projects is to choose/use the proper battery size/model/type. As market is flooded now with a lot of low quality batteries claiming thousands of mAh ( Ultrafire fakes stories is just an example) the only way to proper check them is to run a set of tests.
A simple basic tester that will be able to monitor over the entire battery lifetime at least few parameters like, voltage, current, power consumption and stored energy between charges can give you valuable informations about the parameters and health of the battery. And of course also you can see how are looking the numbers against the datasheet claims :).
Step 1: What we will need:
- CBDBv2 Evo Board ( or any other ESP8266 Board you may like but who has voltage/current measurement capabilities)
- INA21x – Current shunt monitor
- USB adapter (take a look here for more details about the USB Adapter)
- Li-Ion Battery Module
- 2 x 10 Ω /10 W resistors
- Connection wires – various colors
For More Details: WIFI Battery Monitor System – ESP8266