Bosch 10.8V / 12V battery rebuild / disassembly & replacing cells

Rebuild of an non original (fake) 3.000mAh battery for my 10.8V / 12V Bosch tools I got from ebay some time ago. The real capacity was around 1.500mAh which was quite too low for my normal workflow. I decided to replace the 18650 cells with some 2.500mAh 18650 batterys which I obtained from an old electric bicycle to "tweak" its performance. This is my first ever video, so leave some feedback in the comments. In case there are any open quesitons, feel free to ask! Sorry for the background sound. I do not own a microphone at the moment to add some audio comments. This will be something to be included in future projects :)