I am thinking of using small coin cells to power white LEDs (20mA @ 3V FWD voltage). When I look at some coin cell specs sheets, I've seen "recommended discharge current" of only a few mA or less (e.g. >1mA or >3mA). If I choose a cell with 1mA recommended discharge current, does that mean I need 20 of them connected in parallel to provide 20mA (assuming cell has 3V rating)? But I have seen cheap LED lights powered by a single coin cell rated at only 1.4-1.6V (perhaps the LED has much lower forward voltage, but current must be much larger than a few mA).
So what exactly does the "recommended discharge current" mean in the coin cell specs, or does it matter at all for simple electronic project like lighting up LEDs?