I need a voltage divider to make it possible to measure voltage on the 3S LiPo battery that delivers around 11 V using a device that measures up to 4 V (approx). I can make one, no problem, just solder two resistors with resistances in the more or less 1:3 ratio (measured output is sent as a single byte value and is later scaled by the RC receiver before being displayed, so it doesn't matter how precise the divider is, as I can change the scaling constant). I know from googling that the total resistance of about 10-80 kΩ works, so it gives me enough information to buy resistors, trivial and no problem. However, I googled for schematics, and found that on some of them there is an additional capacitor added on the output side. What role does it play?