Laptop battery is charged by an external power. Which is usually output dc voltage and provide power to system and charge battery simultaneously. When battery fully charged continue supply to the system through the adaptor and cut battery charging.Every laptop has his own type of configured battery charging circuit. The charging process is managed by“HP CQ40 BATTERY CHARGING DISCRIPTION”

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Hp CQ40 B+ Supply With Hp Adaptor Introduction

Cq40 is commonly using and very often find a laptop and its circuit is very basic similarities with other hp models. So I explained it’s main power source  B+ Supply section First. it is Operate with hp’s 3 pin adapter architecture. It is very often used by others companies like Dell, Lenovo etc. It protects“Hp CQ40 B+ Supply With Hp Adaptor Introduction”

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