Yes, as long as the voltage of the small battery and the solar panel is the same, you can use the large solar panel to charge the small battery, the large solar panel to charge the small battery, the current is large, the charging speed is fast, and the battery will be full of electricity in a very short time. It saves time, but using a large solar panel to charge a small battery, the charging current is large, and if used for a long time, the service life of the battery will be damaged.