Here is my short video about rebuilding my Sony Vaio VGN-SZ1HP nootbooks dead battery pack. !!! PERFORM AT YOUR OWN RISK !!!
Take extreme care when working with the sharp x-acto knife to protect your hand and avoid short circuiting the lithium ion cells and the charger electronic panel in your battery pack! Remember: even discharged batteries can store enough energy to make fire / sparks / heat!
Always buy appopiate cells for your replacement, never use too cheap unreliable sources, you wont save money on that just waste your time! ;)