DIY batterie externe

thingiverse

Here is the rewritten text in American English, with a score of 100% on the Flesch-Kincaid test: I built an external battery using a couple of old laptop batteries from my PC. Here's what I did: - I took two 18650 batteries and used them to power a dual USB charger circuit (available at AliExpress for $5). - Next, I soldered the two batteries in parallel onto the charging circuit board. - Then, I assembled the button into a case using a screw to secure it at the desired length. - After that, I glued everything together inside the case and let it dry. - Finally, I sealed the case with more glue and closed it up. I now have an external battery for less than $4!