I'm getting ready to assemble my Mintyboost and Solar LiPo charger kits and would like to pimp them out with a couple of meters. I'd like to add a volt meter to measure the battery voltage while a device is charging but I'd prefer that it not be powered if there's no load on the charger. I could wire in a switch to turn off the display, but could I use a 3-wire volt meter (ID 705), connect the power leads to GND and LOAD and the third wire to BATT? That way, if there's no load there's no power to the meter and it won't drain the battery.
I'm also planning on using this quite a bit over the summer and would like to connect a temperature meter but only want to have it display while the battery is charging (i.e. when the unit is out in the sun). Again, I could simply connect it to +5V and GND with a switch (again, so as to not drain the battery when it's not charging), but I was wondering if I could I connect the sensor to DC IN and STAT1 (instead of or in parallel with an orange LED) to have it display only while charging. Since the temp meter (ID 576) requires a minimum of 4.5V to run it wouldn't function (and again, drain the battery) in a low battery condition.
Will these work or am I completely out to lunch? It's been a long while since I've dabbled in electronics. Thanks.