I am testing out Libelium's solar power module for Arduino: http://www.sensor-networks.org/index.php?page=0828028040
I need to monitor the li-ion battery and take action when it reaches the low-voltage threshold. Two problems + associated questions:
a.) the battery manufacturer does not state what the low-voltage threshold is on their data sheet. Is there a standard way for calculating this?
b.) the board converts the battery's 3.7V to 5V, meaning that what is coming off the board is not a true reflection of the battery's current voltage. Is the best approach monitor the battery voltage before it enters the board to get a 'true' reading, or is there some way to use what is coming off the board?
thanks in advance