Project checklist did i miss anything?

So I have a project that I have been working on and it has come a long way and its close to completion. I wanted to build sensor micro-controller that senses Carbon monoxide, air quality, Temperature and human pulse and display it on a GLCD. I want it to be portable so it will be powered by LIPO batteries. Here is a list of parts that I will be using in the project. I have tested and written code for all the sensors except the pulse sensor,which I'm doing now until all the remaining parts come in. If anyone can see anything i forgot to add or If you have suggestions on what else I could add please let me know. Also let me know what you think of my project.

GLCD (https://www.sparkfun.com/products/9351) Arduino Pro Mini 328 - 5V/16MHz (https://www.sparkfun.com/products/11113)

Temperature Sensor TMP36 (https://www.sparkfun.com/products/10988) Pulse Sensor (https://www.sparkfun.com/products/11574) Carbon Monoxide Sensor - MQ-7 (https://www.sparkfun.com/products/9403) Air Quality Control Sensor MQ135 (http://www.futurlec.com/Gas_Sensors.shtml) Flashlist SUPER BRIGHT WHITE, SUPERFLUX LED (http://www.allelectronics.com/make-a-store/item/LED-918/SUPER-BRIGHT-WHITE-SUPERFLUX-LED/1.html)

USB LiPoly Charger - Single Cell (https://www.sparkfun.com/products/10161) 2X Polymer Lithium Ion Battery - 2000mAh (https://www.sparkfun.com/products/8483) Momentary Push Button Switch - 12mm Square (https://www.sparkfun.com/products/9190)

My only big parts left to do are; 1. Change the code I have for a serial my 16X2 LCD (https://www.sparkfun.com/products/9069) to the GLCD. 2. Make the housing for everything 3. hook it up.

So a few thing I have questions about. 1. If i put two 3.7V LIP batteries in series to get 7.2V will the above LIPOly charger still charge them since its the same current? 2. I've been using a Arduino Uno/RedBoard to do all my prototyping will I be able to easily go to the Pro Mini without losing anything?

Yigiter007: So a few thing I have questions about. 1. If i put two 3.7V LIP batteries in series to get 7.2V will the above LIPOly charger still charge them since its the same current?

I wouldn't expect that to work at all, since the LiPo battery voltage would be far higher than the voltage the charger was designed to support. That is a [u]single cell[/u] charger. I don't know whether it's safe to charge your two cells in series but with most LiPo types that is considered dangerous since the cells can go out of balance and over-charging or over-discharging LiPo cells can lead to a fire hazard.

Thank you for your reply. Could the batteries be setup to charged separately and then be connected in series to power my project with transistors? Where I would use the Arduino voltmeter to sense when the first battery is charged and then switch the charger to the second battery and charge it. Then in the project it would activate transistors or some other circuit to connect them in series to power the project. If it isn't possible to use 2X 3.7V LIPO batteries would I have to use a Joule stealer or some other way to boost the 3.7V to 5V ?

I was looking online on way to boost the voltage from a single 3.7 LIPO battery to 5V and I found this (https://www.sparkfun.com/products/11231) .

So should I just use one 3.7V LIPO battery and just get one that has the highest mAH rating and boost it to 5V and not try to use two batteries at once?