Why manufacturers still design custom battery packages of an industry standard?

Recently I refresh a laptop battery with new 18650's. This is working however it still doesn't last very long because of the chip inside this battery.

The chip must recallibrated (data is incorrect and based upon previous batteries) but cannot do this. There are smart chargers that can charge 18650 without any problem and can determine the condition of the cell as well. So why is the charge circuit inside the battery and not inside the device? The circuitry/chip inside the battery makes the...

Why manufacturers still design custom battery packages of an industry standard?

Why manufacturers still design custom battery packages of an industry standard?