This is the sticker you find on iPedal chargers. Be careful, to charge safely, plug the charger into the outlet before plugging it into the battery. If you don't, it will pop and over time can damage the connector. 

red lightmeans it's loading.
green lightIt means that the charge has reached the end, but if you unplug it, even if the battery is discharged, it will light up green because it is not charging.