| DavidWardlaw |
Hello,
I want to extend my laptop's battery life without tinkering with the battery itself. I read that a battery power supply could be plugged into the power input on a laptop to increase battery life.
My question is: Is it possible to create a lithium-ion battery power supply that charges batteries when they need to be charged, but automatically stops charging the batteries when a certain voltage is reached? Is there a PCB for it? |
|
|
| Boris_The_Blade |
If you are charging plain batteries, you can use a comparator with hysteresis to determine when to charge the battery. This, however, I believe will not work with a laptop because...
laptops have their own battery chargers built in that regulate the 19V typical to a constant current (until a voltage threshold is reached) that charges the batteries. Once the batteries are charged, then it only supplies power to the computer, with possibly a trickle charger to the li-ion pack .
If you can get into the computer battery terminals while it is installed, you might be able to do what your thinking, but it's a bit risky with an expensive laptop.
The other alternative is to hook up the external charging battery to a commercial power inverter ($30 typical) that your laptop wall supply is plugged in to. |
|
|
|
