I'm looking into using an old Samsung Lithium battery from an old cellphone to power my Arduino Uno. The battery is rated at 3.7V, 1000mA. I've got 2 questions
[u]1. Charging the battery[/u] I've purchased the following 1A Lithium Battery Charging Board http://www.benl.ebay.be/itm/310684746132?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
The board has a fixed 1.2K resistor mounted to facilitate the 1A charging. I read that the charging current should be 37% of the battery capacity, so in my case it would be about 370mA.
Am I correct in saying that I should replace the 1.2K resistor with either a 4K (to have 300mA current) or a 3K (to have 400mA current ?). Would the 4K or 3K option be a safe way to charge this battery using the board ?
[u]Using the battery on Arduino[/u] Now, as my Arduino board expects a 5V input, I guess I also need some kind of DC-DC Converter Step Up Boost Module ? (I tried hooking up the battery to the VIN pin of the 5V Arduino and it did seem to work, but I guess supplying the required 5V would be better).
I was looking at something like this > http://www.benl.ebay.be/itm/3V-to-5V-1A-Charger-for-MP3-MP4-Phone-DC-DC-Converter-Step-Up-Boost-Module-/310533228391?pt=LH_DefaultDomain_0&hash=item484d390767&_uhb=1
This could take my 3.7V battery input and convert it into a stable 5V output, required to power the Arduino.
Would this kind of setup make sense ?