We use 9V batteries in our electronics & Arduino projects, but those batteries are not long-lasting. This is a step-by-step guide for making a rechargeable 9V battery. This is cost-effective & easy to use. You can recharge it using a 5V smartphone charger. *************************************************************** [DISCLOSURES] This video may contain affiliate links, which afford Techno Review 85 Network a commission should you make a purchase. As an Amazon Associate I earn from qualifying purchases. ********************************************************************* Connect with me on Instagram - https://www.instagram.com/technoreview85/ Follow my Facebook page - https://www.facebook.com/trv85/ ******************************************************************** #technoreview85 #9voltbattery #diy