Does laptop batteries have internal charge AND balancing board?

I have restored a lot of cells from old laptop batteries and i wonder if the BMS inside laptop batteries does booth charging and balancing?

When i search "Battery BMS" on AliExpress it seems to only have charge BMS boards without balancing.

Someone that know?

Laptp batteries have a circuit board that talks to the laptop via SMBUS communication. It's called a "Smart battery" - It measures voltages, current, temperature etc. It does not have ability to balance the cells. The cells are matched at the factory for internal resistance so they will work together.
Charging is done by a dedicated circuitry in the laptop as well.

// Per.

Thanks :slight_smile:

Do you know where to buy that? Or what to search for?

What do you want to buy?

// Per.

Some boards have version with balancing 18650 Lithium battery protection board.

Of course I am referring to old laptops, but in those I have seen the battery has a connector which brings out all the connections between the cells and the laptop proper contains the balancing circuitry.

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