Maintenance-free lead-acid battery

Note: Check the magic eye regularly and keep it fully charged.

      Because the maintenance-free battery does not have a water filling hole and a battery liquid level scale. We need to judge the state of the battery through the "magic eye" on the battery. If the magic eye is green, it means the battery is normal and fully charged; if the magic eye is black, it means it needs to be charged; if the magic eye is white, it means the battery needs to be replaced.