Automatically Battery Disconnect

Varun Ramesh wrote:

 

It is recommended that for optimal operation a battery (laptop, phone etc.) must be maintained at a charge between 40$-80% never more, never less.

am trying to build a circuit that hooks on to either my laptop charger or my phone charger.....and turns on or turns off the charger based on if the present charge is less that 40% or more than 80%.

Battery life is extended if you don't fully discharge the battery, but if you build a circuit that connects between your charger and the laptop, then if you use your laptop plugged-in for a day, your circuit will make the laptop to run off the battery because it will disconnect the power cord, then it will charge it, then disconnect the power cord again to cause the laptop to run off the battery again, etc. This could be worse than letting your laptop internally stop the battery charging through it's internal circuitry while it continues to be powered from the power cord.

Also, apparently Li-Ion batteries have a limited life even if you don't use them. They don't last longer than a year in my laptop, and maybe 12-18months in my mobile. Apple manages a longer time in their products apparently (I don't know) but I'm guessing they're doing more sophisticated things maybe on a per-cell level.

Varun Ramesh wrote:

 

It is recommended that for optimal operation a battery (laptop, phone etc.) must be maintained at a charge between 40$-80% never more, never less.

am trying to build a circuit that hooks on to either my laptop charger or my phone charger.....and turns on or turns off the charger based on if the present charge is less that 40% or more than 80%.

Battery life is extended if you don't fully discharge the battery, but if you build a circuit that connects between your charger and the laptop, then if you use your laptop plugged-in for a day, your circuit will make the laptop to run off the battery because it will disconnect the power cord, then it will charge it, then disconnect the power cord again to cause the laptop to run off the battery again, etc. This could be worse than letting your laptop internally stop the battery charging through it's internal circuitry while it continues to be powered from the power cord.

Also, apparently Li-Ion batteries have a limited life even if you don't use them. They don't last longer than a year in my laptop, and maybe 12-18months in my mobile. Apple manages a longer time in their products apparently (I don't know) but I'm guessing they're doing more sophisticated things maybe on a per-cell level.