RePower

thingiverse

Recently I acquired five "ancient" tablet PCs (HP Slate 2) and discovered their internal components to be extremely intriguing. Among these components were LiIon batteries, two in every tablet, with a maximum capacity of 15Wh per cell. Measurements revealed that the actual capacities exceeded expectations at nearly 4300mAh per cell, despite being labeled as 4000mAh. Thanks to HP's careful selection of component suppliers years ago! As I already possess PowerBank PCB modules that were useless for their intended purpose, a brilliant idea struck me. Here is the result: an 8000+ mAh power bank with dual USB output and a blue backlighted LCD display, reminiscent of Chinese devices. To build this project, you'll need: 1) Two LiIon cells from HP Slate 2 tablet PCs (which can be stubborn to remove due to their adhesive backing). Alternatively, you can use the same size: 6.1 x 67 x 90 mm, or smaller. 2) A Dual USB PCB similar to https://www.aliexpress.com/item/Dual-USB-5V-1A-2-1A-Mobile-Power-Bank-18650-Battery-Charger-PCB-Power-Module-Accessories/32694942781.html (which I found to be quite expensive, at US$2.25 per PCB - I'll definitely buy more of these!). 3) Two M1.6 hidden head screws and two M1.6 nuts. This project was printed using ABS plastic with a 0.3mm nozzle, 0.15 mm layer height, four layers on top and bottom, and two wall layers. PS: A free flashlight is included with this gift!