Betri (kutoka Kiingereza: "battery") ni kifaa kinachotumika kutunza chaji ya umeme kwa muda fulani. Ilibuniwa na Mwitalia Alessandro Volta mnamo 1800. Betri ya gari Wikimedia Commons ina media kuhusu: Battery Non-rechargeable batteries HowStuffWorks: How batteries work Other Battery Cell Types DoITPoMS Teaching and Learning Package- "Batteries" The Physics arXiv Blog (17 August 2013). First Atomic Level Simulation of a Whole Battery | MIT Technology Review. Technologyreview.com. Iliwekwa mnamo 21 August 2013. Makala hii kuhusu teknolojia ni fupi mno. Unaweza kuipanua kwa kusaidia Wikipedia kuongezea habari juu yake.