This is my first design job outside of school and I have done some reading about this, but I am still unsure. I am working on a water level sensor which will be used to measure the water level in wells in some remote areas where cellular signal may be unreliable. As a result, we are putting an sd card reader into the device as a backup. The sd card reader has chunky current requirements of ~450mA, which is detrimental to battery life.
From the Boron datasheet:
Peak Current ILi+ pk 120 490 mA
Assuming worst case scenario current from the Boron, I am looking at close to 1000mA current requirements for my device. Based on this, I calculate ~85.6 days of battery life if the device turns on once a day for 120s and does its job and then goes back to sleep.
Also from the Boron datasheet:
This pin is internally connected to the positive terminal of the LiPo connector. You can connect a single cell LiPo/Lithium Ion or a DC supply source to this pin for powering the Boron. Remember that the input voltage range on this pin is 3.6 to 4.2 VDC.
I would like to connect two 3000mAh batteries in parallel to keep the 3.7V, but give me 6000mAh. I am unsure if I can do this because I am unsure if this would still qualify as a single cell battery. Can I do this, or will it break the Boron?