App note: How to monitor state-of-charge in small batteries with tiny, ultra-low-power comparators

App note from Maxim Integrated about low current and voltage battery monitors. Link here Many of today’s portable consumer electronic devices are powered by small button or coin-cell batteries. Users, of course, expect long battery life and reliable charge-level information. However, it can be quite challenging to efficiently monitor the health and state-of-charge (SOC) of […]

PIC 12F675 battery monitor using a diode/LED and resistor

Here’s a circuit by Joe Desbonnet’s Random Tech Stuff that’s designed to monitor battery voltage. It uses one resistor, one diode (or LED), one microcontroller ADC input and one digital output. A practical application using a PIC 12F675 is presented. This allows you to monitor battery voltage under load, allowing sufficient time to replace the […]