In battery status indicator , there is one electronic circuit which continuous monitor the level of the battery. For that manufacturer used comparator circuit. If certain level reached then this voltage will turn on the either LED or the LCD screen. This is just simple answer of your question. Hope you have understood
I am Gaurang Kalathiya.I am a biomedical engineer. i want your help to find answer of my question.my question is"during discharge of battery which parameter decreases is that voltage or current??and to indicate status of battery which parameter should measure??"
During discharge, voltage decreases. The amount of decrease in voltage depends on the current consumption of ur ckt.
& for microlab(sunish),
For battery status monitoring, it can be made by compairing the circuit voltage with a fixed voltage(say ZENER diode).
If voltage falls below the ZENER voltage then u can indicate this by an led or else.
If ur query is solved then dont forget to press the help me button.
why battery status indicator needed means
we should know how much power remaining in the battery and these help us to charge your battery when it goes too low ...