I am now using LIPO batteries for my LED designs.
I have a 1 amp PTC fuse with a battery monitor (tiny13).
My initial design used the BOD fuse set at 2.7VDC and I powered the Uc with from the balance plug so I could monitor just 1 cell. This eliminates the resistor voltage divider as I am using a 4cell pack for this design. I used a diode in series with the voltage input of the chip so that brown out at 2.7VDC is actually 3.3VDC of the battery.
Testing, I am running at 128khz and the chip is using just .025mA when the power is above 3.3V and the chip actually uses up too 0.300mA at the point where it hit's the BOD.
Going to scrap that idea and use the ADC instead.
Question, does anyone make a complete shutoff LIPO battery monitor? I did design a micro servo and micro switch combination to physicaly disconnect the battery from the load. A momentary switch is pressed, micro powers up and moves servo to allow micro switch to close, monitors voltage and rotates servo to off position if under voltage. Works fine but a bit bulky.
Is there a latching silicon chip micro switch available to do something like this and will allow high amperage 10,20..50 amps for RC motors? I know the ESC's used for the motors have a shut down but they also can drain the LIPO if not disconnected. A full shutoff would be nice, not sure if a cell phone has a full shutoff or not.
This is the 10 watt drum light I am making for a drum group.
Just tested using ADC after turning off the BOD. I use a second pin to power a resistor divider for a microsecond. Now it runs at 0.005mA Lower then the discharge rate of the battery.