I was measuring the voltage across a 12v VRLM battery when I noticed something : the battery had 11.7 volts without the load and when the load was added, the voltage dropped to 11.4. I don't want to have to disconnect my battery just to get a low battery indicator to work properly. How can I know if my battery is low when I have it "in use"?
How to detect low battery under load
batteriesvoltage
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Best Answer
You decide what the "low" threshold voltage level when the battery has its load on it. This way you will know when the battery gets to critical level of capacity corresponding to what load it is expected to power. Trying to do this when the battery is unloaded will not give you a realistic in system usage scenario.
Think about your car. Its battery stays connected to the alternator / voltage regulator all the time -- unless you remove the cable to do service work.