Help w/ low battery indicator please

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The discussion centers on installing a low battery indicator for an 11.1v battery system, specifically a single red LED that activates below 7v. The user seeks guidance on suitable components and is uncertain about how to calculate the voltage threshold. Suggestions include using an op-amp and a zener diode, as well as exploring dedicated battery monitoring ICs from manufacturers like Maxim. The user expresses a lack of confidence in their electrical knowledge but is eager to find a solution. Overall, the focus is on identifying the right components and methods for creating an effective low battery indicator.
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Any help is appreciated,

I have a 11.1v battery system, an I would like to install a low battery indicator. I would like the indicator to be a single red LED that initiates when the voltage drops below 7v. Size is definitely a concern here.

I have looked online at various templates, but I just can't find what I am looking for. I admittedly only know enough about electrical circuits to get myself in trouble. I suppose the main question is; what type of components should I use? I'm not sure I know how to do the math to get the threshold set at 7v.
 
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