Can We Charge Laptop Battery Externally. The laptop is charging the battery instead of the other way around. But very few modern laptops have removable batteries.

As long as you take some common-sense precautions you can use a laptop without its battery. Basically its a combination between a hub and a USB-C charging. Ideal for charging the laptop battery if the laptop cannot charge it due to faulty motherboard or faulty DC socket.
Never Heat Your Battery.
ELECJET PowerPie 20000mAh USB C PD 45W Laptop Power Bank Super Fast Charging 20 PPS Battery Pack for Samsung Note 10 plusS20 UltraNote 20 Portable Charger External Battery for MacBook ProAir. Rating of your laptop battery quantity with help of circuits rectifier filters. The laptop or any portable device now days runs on stored DC power only. The following is a complete guideline for properly and safely charging your laptop battery.
