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Something like this may work. https://m.aliexpress.com/item/4000289210562.html?spm=a2g0n.detail.0.0.880e62a02ivq1U&gps-id=storeRecommendH5&scm=1007.18500.187585.0&scm_id=1007.18500.187585.0&scm-url=1007.18500.187585.0&pvid=2c2be017-42d8-492e-9a9b-d67f5341abd9&_t=gps-id%3AstoreRecommendH5%2Cscm-url%3A1007.18500.187585.0%2Cpvid%3A2c2be017-42d8-492e-9a9b-d67f5341abd9%2Ctpp_buckets%3A668%230%23131923%2354_668%23888%233325%239_668%232846%238107%231934_668%232717%237567%23912__668%233374%2315176%23928&browser_id=bad6884fab3b46f983212365fecfadad&aff_trace_key=438c73d1c2144e179d1d3d014ec35048-1603092259884-09918-UneMJZVf&aff_platform=msite&m_page_id=u5jafrevm3scasuo176ed0f66281dd40139c21e326&gclid=&_imgsrc_=ae01.alicdn.com%2Fkf%2FH0f965b03ff6b48a79a9c29d899a7c9a8t.jpg_640x640Q90.jpg_.webp It's a power bank which uses 6x 18650 lipo cells (sold separately) and is able to deliver plenty of current over a wide range...