I research and test lots of batteries, together with some that are smaller than a Tootsie Roll (for very small gadgets for instance a stylus or penlight) or larger than an overweight English bulldog (to help keep vital electronics managing through a power outage or tenting trip). Mau to start https://flenzy.store/versatile-300w-500w-portable-power-station-emergency-rechargeable-generator-with-qc3-0-dual-voltage-110v-220v/