DIY: VAIO Fat Battery-Pack!

What you gonna do if you have an old Laptop with 1200MHz Pentium III M Processor and just invested a few bucks for a hard to find RAM upgrade to 640MB and even a couple of months ago your Harddisc failed and you spend a few more for another one with 160GB and then suddenly the Battery sucks??? Not to mention the time you have invested for getting it up again!!! Well it's a hard decision either you buy a new Battery Pack, or leave it non-portable with the Power Supply...

Non of it!

 

 

Take Three Sealed Lead-Acid Batteries with 6V and 4,5Ah and build a better one by yourself.

As the pictures document, first was to open the Laptop to get access to the Power Connector.

Soldering some wires to "+" and "-" and take them out was the next step.

Then a modification was essential of the original upper Battery Case to fit in the 3 new ones :)

After that they had to be connected together in series and wired up with the plus and minus wires.

I used also a micro-switch for interrupting connection, if it is used for a long time with the Power Supply then they would be overcharged.

Some Tape was used to patch them to the Battery Case Part so it snatches with it to the Battery Compartment of the Laptop.

The Laptop has a slope now but it is a nice side-effect because typing is much more comfortable yet.

The Power Supply delivers 19.5 Volts, the Batteries have only 18 Volt in total - but it works and i can use it for a longer time then i would be able with the original Battery!

I checked the broken Battery Pack and found out there was a defect with the board, the cells are still working and been removed to use in this post.