Hi there. I have some semi-functional li-ion laptop batteries laying around, i have opened all of them, now i have 3 packs that have some life in them. I want to use them for different projects around the house.
I have started a thread before on this forum about IC to charge at 12,6V (11.1 or 10,8v nominal) but it is problematic to charge them purely in series as a single unit due to possible disbalances. Therefore I will try to use controllers that are inside the battery.
I have managed to get 2 of them to charge (1 just directly connecting to positive and negative terminals, another with a small clicky switch to get a required impulse to start charging). I am still working on the last one to charge.
The question is, if the cells are connected in 2p3s system, the charge voltage would be 12.6V to charge both 10.8V and 11.1V packs, provided that i charge the cells directly. But how much of voltage do i have to supply to the controller so it controls the whole charging process? Knowing that most power bricks are 18-20V there has to be a dc-dc converter for charging a battery somewhere. Is it inside the laptop or the battery itself?
Long story short, do i have to supply those 18~20~whatever-high-volts to the pins of the battery controller and it regulates the voltage itself, or i have to give it much lower voltage (close to 12.6V i assume) not to cook the cells.
And does the battery controller itself regulate the charging process, for CC, CV, balance stages? Or it is the laptop doing it over the data/clock pins?
I have started a thread before on this forum about IC to charge at 12,6V (11.1 or 10,8v nominal) but it is problematic to charge them purely in series as a single unit due to possible disbalances. Therefore I will try to use controllers that are inside the battery.
I have managed to get 2 of them to charge (1 just directly connecting to positive and negative terminals, another with a small clicky switch to get a required impulse to start charging). I am still working on the last one to charge.
The question is, if the cells are connected in 2p3s system, the charge voltage would be 12.6V to charge both 10.8V and 11.1V packs, provided that i charge the cells directly. But how much of voltage do i have to supply to the controller so it controls the whole charging process? Knowing that most power bricks are 18-20V there has to be a dc-dc converter for charging a battery somewhere. Is it inside the laptop or the battery itself?
Long story short, do i have to supply those 18~20~whatever-high-volts to the pins of the battery controller and it regulates the voltage itself, or i have to give it much lower voltage (close to 12.6V i assume) not to cook the cells.
And does the battery controller itself regulate the charging process, for CC, CV, balance stages? Or it is the laptop doing it over the data/clock pins?
Comment