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Hi Friends ,  DIY is always fun and awesome, and so welcome to another word of tech byte... This note is a collective scratchpad of troubleshoot methods and fixes i came across recently for fixing my laptop battery that went bad. Battery Model   : HP HS04  battery pack (4 cell , lithium ion, 14.6V , 2670 mAh, 41 Wh) Laptop  Model  : HP 15-ac635tu   (equivalent to HP G4 250 Notebook) The Symptoms Laptop Showed 1. Laptop charger goes on and off intermittently after charging up to more than 60% . The charger port LED goes between charging and not-charging frequently. 2. Once laptop is running from battery, charge percentage drops faster than normal, and once it reaches 23% , laptop shuts off immediately. On power in on again the charge percentage will be less than 15% and wont complete bootup to desktop. Faints instantly. Troubleshooting 1. Borrowed a laptop charger from my friend and tried 2 or 3 charge cycles. But still the issue...

A short note for people trying to upgrade  an old laptop Wifi /Bluetooth module and Antenna Hi... Welcome to another tech byte.. So , you are at the right place to read further , if you looking forward with below reasons.. 1. You have an old laptop, which doesn't support new 5Ghz WiFi band , and pretty old Bluetooth version.(v4.0 or below) 2. You have a shitty old Realtek Wifi/BT Hardware , which dosen't have an updated Win 10 driver 3. You are living with a laptop which is shy to walk away from your home WiFi router.You just found out that your laptop only has a single patch antenna and suffers from serious signal strength issues. Ok then..Now what to look for...? What to understand...? What to understand before shopping new hardware.. 1. Digg out the detailed manual of your laptop model . Its is  quite handy for doubts. 2. Understand the connector type of the wifi/bt hardware module to laptop main board(open up  laptop and see)     It coul...