|"Dead" laptop batteries. Used force and screwdriver to open them. Watch your fingers, you will need them trough entire life. You can see the 18650 LiPo modules in blue and green.|
I discovered that there a hundreds of projects using the same refurbished module ranging from simple cell phone power packs to large solar system batteries.
Here is a tutorial on how to make a replacement hand drill battery pack with 3d printer and 18650 modules from http://www.thingiverse.com/thing:1042761:
Here is a tutorial on how to create a larger battery pack with 3d printed frame modules for storage of solar power that can be used in small electric vehicles:
There is large number of 3d printed projects with 18650 battery modules:
Also take a look at: http://www.instructables.com/howto/18650/
Do keep in mind that you will have to test each module and that there will be some that are just dead and can not be used.
Since you can make battery of any size, you can literally make a Tesla powerwall equivalent for a fraction of the originals 3500+ USD price. This guy made a DIY Tesla powerwall for some 300 USD:
Think about it: a battery for your entire house for just 300 USD made from junk old laptop batteries. You will probably have many many questions so I strongly recommend checking the entire content on Jehu Garcia YT channel. This guy is a battery guru!
Soon I'm going to visit our regional electronic waste processing company in town of Slavonski Brod to see if they can give me more old laptop batteries to salvage the 18650 modules.
Do you have any experiences with 18650 batteries or any projects you made? Let me know in the comments!