134N3P module 26650 Li-Ion battery powerbank

thingiverse

Also check out this: https://www.thingiverse.com/thing:3110308 I received some cheap 18650 powerbanks as gifts. I use them occasionally to charge gadgets. The 18650 batteries they hold are subpar since it can only output about 800mah. So, I decided to harvest its electronics (134N3P module) and install a high-capacity 26650 5000mah lithium battery instead. This design is a box that holds them together securely. The electronics are standard in many cheap powerbanks, consisting of a small board with normal USB and microUSB connectors - they're easily found if you know what I mean. Simply insert the electronics, make contact with the battery, close the box with its sliding lid, and it's done - 5 times the original charge capacity. I recommend printing this in ABS since cheapo electronics can get warm and soften PLA. Enjoy. TODO: 32650? 18350? 16340? Double? Customizable? Desktop model with Current/Volts LCD? Wings?... (I'll pass on wings for now; let's hope it doesn't 'fly away'!) UPDATE (17-OCT-2016): I added some pictures. A new part was added to keep the electronics in place securely. Also, a box design with ears was included to help with warping when printed in ABS - just remove them with a knife or something when finished. UPDATE (11-AUG-2016): Introducing V3, similar to previous designs but with a more convenient sliding lid. The older version has been removed along with its pictures. UPDATE (11-AUG-2016): Minor changes were made to enhance board fitting, and I added a cap to the lid to press fit the board over the USB connector. V2 is now the only supported model - I removed the older versions and updated STL's and sources. UPDATE (10-AUG-2016): V2 has been added with 26650 label etching. The lid has just one removal hole, breathing holes have been added to the box & lid for LEDs, fillet box edges were added, new V2 pictures are included, and FreeCAD sources were updated - older model sources were removed because it's easy to revert changes to V1.