The most important thing is to choose a solar camera with a large battery capacity, the battery capacity of a solar security camera determines how long the camera can operate without sunlight. The best solar-powered security cameras come with batteries that provide at least 12 hours of power, even without the sun. Usually, the camera is equipped with 6 18650 batteries, and the battery capacity is at least 21700mAh, which can ensure that the battery can supply power for up to 3 days on cloudy and rainy days without light. If you live in a year-round sunny area, battery choice isn’t the most important thing to you. Longer-lasting rechargeable batteries are essential if you live in an area that doesn’t get a lot of sunlight for part of the year.