Quality Dp Light 18650 Lithium-Ion Rechargeable Batteries H2w

They are a standard size of 18mm x 65mm. They have a nominal voltage of 3.7V. These types of batteries are typically used in high-drain devices like flashlights and laptops. The image shows a capacity label of 4500mAh. They are unprotected cells and should only be used in compatible devices/chargers.